• 3665 Citations
  • 35 h-Index
1987 …2019
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Research Output 1987 2019

2019

Magnetic study of the lower critical field of organic superconductor λ-(Bets)2gacl4

Sari, D. P., Hiraki, K. I., Nakano, T., Hagiwara, M., Nozue, Y., Kusakawa, T., Hori, A., Yamamoto, A., Watanabe, I. & Ishii, Y., 2019 Jan 1, Functional Properties of Modern Materials II. Kurniawan, B., Nugroho, A. A., Darminto, Watanabe, I. & Risdiana (eds.). Trans Tech Publications Ltd, p. 296-301 6 p. (Materials Science Forum; vol. 966 MSF).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Demagnetization
organic superconductors
Magnetic variables measurement
Needles
Superconducting materials
2018
1 Citation (Scopus)

Charge dynamics and metal-insulator transition in perovskite SrIr1−xSnxO3

Fujioka, J., Okawa, T., Masuko, M., Yamamoto, A. & Tokura, Y., 2018 Jan 1, In : Journal of the Physical Society of Japan. 87, 12, 123706.

Research output: Contribution to journalArticle

insulators
orbitals
metals
metalloids
substitutes

Cu hyperfine coupling constants of HgBa2CaCu2O6+δ

Itoh, Y., MacHi, T. & Yamamoto, A., 2018 Jul 26, In : Journal of Physics: Conference Series. 1054, 1, 012006.

Research output: Contribution to journalConference article

nuclear spin
spin-lattice relaxation
echoes
anomalies
nuclear magnetic resonance
2017
17 Citations (Scopus)

Correlated Dirac semimetallic state with unusual positive magnetoresistance in strain-free perovskite SrIrO3

Fujioka, J., Okawa, T., Yamamoto, A. & Tokura, Y., 2017 Mar 3, In : Physical Review B. 95, 12, 121102.

Research output: Contribution to journalArticle

magnetoresistivity
Magnetoresistance
Perovskite
Paramagnetism
Galvanomagnetic effects
3 Citations (Scopus)

Evidence for Weakly Correlated Oxygen Holes in the Highest- Tc Cuprate Superconductor HgBa2Ca2Cu3 O8+δ

Chainani, A., Sicot, M., Fagot-Revurat, Y., Vasseur, G., Granet, J., Kierren, B., Moreau, L., Oura, M., Yamamoto, A., Tokura, Y. & Malterre, D., 2017 Jul 31, In : Physical Review Letters. 119, 5, 057001.

Research output: Contribution to journalArticle

cuprates
photoelectric emission
x ray absorption
x ray spectroscopy
absorption spectroscopy
1 Citation (Scopus)

Magnetic susceptibility of optimally doped HgBa2CuO4+δ

Itoh, Y., Machi, T. & Yamamoto, A., 2017 Dec 13, In : Physical Review B. 96, 23, 235118.

Research output: Contribution to journalArticle

Magnetic susceptibility
Powders
Superconducting materials
Charge transfer
rocks
3 Citations (Scopus)

S= 12 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6

Gibbs, A. S., Yamamoto, A., Yaresko, A. N., Knight, K. S., Yasuoka, H., Majumder, M., Baenitz, M., Saines, P. J., Hester, J. R., Hashizume, D., Kondo, A., Kindo, K. & Takagi, H., 2017 Mar 21, In : Physical Review B. 95, 10, 104428.

Research output: Contribution to journalArticle

Ladders
ladders
orbitals
Exchange coupling
Neutron diffraction
5 Citations (Scopus)

Ultraslow fluctuations in the pseudogap states of HgBa2CaCu2 O6+δ

Itoh, Y., Machi, T. & Yamamoto, A., 2017 Mar 6, In : Physical Review B - Condensed Matter and Materials Physics. 95, 9, 094501.

Research output: Contribution to journalArticle

Exponential functions
exponential functions
nuclear spin
cuprates
echoes
2015
2 Citations (Scopus)

Coexistence of monochalocogen and dichalocogen ions in BiSe2 and BiS2 crystals prepared at high pressure

Yamamoto, A., Hashizume, D., Bahramy, M. S. & Tokura, Y., 2015 Apr 20, In : Inorganic Chemistry. 54, 8, p. 4114-4119 6 p.

Research output: Contribution to journalArticle

Ions
Crystals
crystals
ions
Substitution reactions
16 Citations (Scopus)

High pressure effects revisited for the cuprate superconductor family with highest critical temperature

Yamamoto, A., Takeshita, N., Terakura, C. & Tokura, Y., 2015 Dec 1, In : Nature Communications. 6, 8990.

Research output: Contribution to journalArticle

High pressure effects
pressure effects
cuprates
critical temperature
electrical resistivity
9 Citations (Scopus)

Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3 O8

Fauqué, B., Xu, X., Bangura, A. F., Hunter, E. C., Yamamoto, A., Behnia, K., Carrington, A., Takagi, H., Hussey, N. E. & Perry, R. S., 2015 Feb 25, In : Physical Review B - Condensed Matter and Materials Physics. 91, 7, 075129.

Research output: Contribution to journalArticle

Metal insulator transition
Thermal conductivity
thermal conductivity
insulators
Scattering
2014
Mercury (metal)
Mercury
Oxides
Transition metals
metal oxides
2013
2 Citations (Scopus)

Quantifying covalency and metallicity in correlated compounds undergoing metal-insulator transitions

Chainani, A., Yamamoto, A., Matsunami, M., Eguchi, R., Taguchi, M., Takata, Y., Takagi, H., Shin, S., Nishino, Y., Yabashi, M., Tamasaku, K. & Ishikawa, T., 2013 Jan 9, In : Physical Review B - Condensed Matter and Materials Physics. 87, 4, 045108.

Research output: Contribution to journalArticle

Metal insulator transition
metal compounds
metallicity
insulators
Screening
36 Citations (Scopus)

Zero resistivity above 150K in HgBa2Ca2Cu 3O8+δ at high pressure

Takeshita, N., Yamamoto, A., Iyo, A. & Eisaki, H., 2013 Feb, In : Journal of the Physical Society of Japan. 82, 2, 023711.

Research output: Contribution to journalArticle

electrical resistivity
hydrostatic pressure
superconductivity
transition temperature
signatures
2012
52 Citations (Scopus)

Strong coupling superconductivity at 8.4 K in an antiperovskite phosphide SrPt 3P

Takayama, T., Kuwano, K., Hirai, D., Katsura, Y., Yamamoto, A. & Takagi, H., 2012 Jun 8, In : Physical Review Letters. 108, 23, 237001.

Research output: Contribution to journalArticle

phosphides
phonons
superconductivity
heavy fermion superconductors
Fermi surfaces
2011

Metal-Insulator Transition and Magnetic Order in the Pyrochlore Oxide Hg2Ru2O7

Yamamoto, A., Yoshida, M. & Takigawa, M., 2011, In : Journal of the Physical Society of Japan.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Superconducting Phase at 7.7 K in the HgxReO3 Compound with a Hexagonal Bronze Structure

Ohgushi, K., Yamamoto, A., Kiuchi, Y., Ganguli, C., Matsubayashi, K., Uwatoko, Y. & Takagi, H., 2011 Jan 4, In : Physical Review Letters. 106, 1, 017001.

Research output: Contribution to journalArticle

bronzes
superconductivity
rhenium
phonons
transition temperature
2010
8 Citations (Scopus)

Magnetic ground state of pyrochlore oxides close to metal-insulator boundary probed by muon spin rotation

Miyazaki, M., Kadono, R., Satoh, K. H., Hiraishi, M., Takeshita, S., Koda, A., Yamamoto, A. & Takagi, H., 2010 Sep 8, In : Physical Review B - Condensed Matter and Materials Physics. 82, 9, 094413.

Research output: Contribution to journalArticle

Metal insulator boundaries
muon spin rotation
Metal insulator transition
Magnetism
Oxides
1 Citation (Scopus)

On the possibility of MgB2-like superconductivity in potassium hexaboride

Katsura, Y., Yamamoto, A., Ogino, H., Horii, S., Shimoyama, J. I., Kishio, K. & Takagi, H., 2010 Dec, In : Physica C: Superconductivity and its Applications. 470, SUPPL.1

Research output: Contribution to journalArticle

Superconductivity
Potassium
potassium
superconductivity
Boron
18 Citations (Scopus)

Superconductivity in 4d and 5d transition metal layered pnictides BaRh 2P2, BaIr2P2 and SrIr 2As2

Hirai, D., Takayama, T., Hashizume, D., Higashinaka, R., Yamamoto, A., Hiroko, A. K. & Takagi, H., 2010 Dec, In : Physica C: Superconductivity and its Applications. 470, SUPPL.1

Research output: Contribution to journalArticle

Group 5A compounds
Superconductivity
Transition metals
superconductivity
transition metals
6 Citations (Scopus)

Ten layered hexagonal perovskite Sr5Ru5-xO 15 (x = 0.90), a weak ferromagnet with a giant coercive field H c ∼ 12 T

Yamamoto, A., Hashizume, D., Katori, H. A., Sasaki, T., Ohmichi, E., Nishizaki, T., Kobayashi, N. & Takagi, H., 2010 Oct 26, In : Chemistry of Materials. 22, 20, p. 5712-5717 6 p.

Research output: Contribution to journalArticle

Coercive force
Perovskite
Ferromagnetic materials
Ferromagnetism
Curie temperature
2007

Erratum: Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru 2O 7 (Journal of the Physical Society of Japan (2007) 76, (043703))

Yamamoto, A., Sharma, P. A., Okamoto, Y., Nakao, A., Katori, H. A., Niitaka, S., Hashizume, D. & Takagi, H., 2007 Jul, In : Journal of the Physical Society of Japan. 76, 7, 078002.

Research output: Contribution to journalComment/debate

ruthenium
Japan
insulators
oxides
metals
43 Citations (Scopus)

Fermi level shift in la1-xSrxMO3 (M=Mn, Fe, Co, and Ni) probed by Schottky-like heteroepitaxial junctions with SrTi 0.99Nb0.01O3

Sawa, A., Yamamoto, A., Yamada, H., Fujii, T., Kawasaki, M., Matsuno, J. & Tokura, Y., 2007 Aug 2, In : Applied Physics Letters. 90, 25, 252102.

Research output: Contribution to journalArticle

shift
n-type semiconductors
metal oxides
transition metals
electrical properties
32 Citations (Scopus)

Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7

Yamamoto, A., Sharma, P. A., Okamoto, Y., Nakao, A., Aruga Katori, H., Niitaka, S., Hashizume, D. & Takagi, H., 2007 Apr, In : Journal of the Physical Society of Japan. 76, 4, 043703.

Research output: Contribution to journalArticle

ruthenium
insulators
oxides
metals
valence
9 Citations (Scopus)

Pressure-induced transition from a correlated insulator to a fermi liquid observed in geometrically frustrated Hg 2Ru 2O 7 pyrochlore

Takeshita, N., Terakura, C., Tokura, Y., Yamamoto, A. & Takagi, H., 2007 Jun, In : Journal of the Physical Society of Japan. 76, 6, 063707.

Research output: Contribution to journalArticle

Fermi liquids
insulators
metals
elementary excitations
hydrostatic pressure
2006

Phonon softening in HgBa2CuO4+δ and MgB 2

Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Ishikawa, D., Lee, S., Hu, W. Z., Yamamoto, A., Heid, R., Bohnen, K. P., Ishikawa, T., Tajima, S. & Endoh, Y., 2006 Jan, In : Journal of Physics and Chemistry of Solids. 67, 1-3, p. 294-297 4 p.

Research output: Contribution to journalArticle

softening
Superconducting materials
Inelastic scattering
Superconductivity
X ray scattering
2005
7 Citations (Scopus)

Effects of carbon incorporation on doping state of YBa2Cu 3Oy

Yamamoto, A., Hirose, K., Itoh, Y., Kakeshita, T. & Tajima, S., 2005 May 1, In : Physica C: Superconductivity and its Applications. 421, 1-4, p. 1-9 9 p.

Research output: Contribution to journalArticle

Carbon
Doping (additives)
Oxygen
carbon
oxygen
Superconductivity
Carbon
superconductivity
Doping (additives)
carbon
2004
24 Citations (Scopus)

Carbon-substitution effect on superconducting properties in MgB2 single crystals

Masui, T., Lee, S., Yamamoto, A., Uchiyama, H. & Tajima, S., 2004 Oct, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 303-306 4 p.

Research output: Contribution to journalArticle

Substitution reactions
Carbon
Single crystals
substitutes
carbon
60 Citations (Scopus)

Crystal growth of C-doped MgB2 superconductors: Accidental doping and inhomogeneity

Lee, S., Masui, T., Yamamoto, A., Uchiyama, H. & Tajima, S., 2004 Oct, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 31-35 5 p.

Research output: Contribution to journalArticle

Crystallization
Crystal growth
Superconducting materials
crystal growth
inhomogeneity
6 Citations (Scopus)

Metallization of La1/3NbO3 by lithium incorporation

Yamamoto, A., Uchiyama, H. & Tajima, S., 2004 Sep 1, In : Materials Research Bulletin. 39, 11, p. 1691-1699 9 p.

Research output: Contribution to journalArticle

Metallizing
Lithium
Transport properties
lithium
transport properties

Phonon softening in HgBa2CuO4+δ observed by inelastic X-ray scattering

Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Hu, W. Z., Yamamoto, A., Tajima, S. & Endoh, Y., 2004 Dec 1, In : Physica Status Solidi C: Conferences. 1, 11, p. 3130-3133 4 p.

Research output: Contribution to journalArticle

softening
cuprates
scattering
x rays
transition temperature
61 Citations (Scopus)

Softening of Cu-O bond stretching phonons in tetragonal HgBa 2CuO4+δ

Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Hu, W. Z., Yamamoto, A., Tajima, S. & Endoh, Y., 2004 May 14, In : Physical Review Letters. 92, 19, p. 197005-197001 5 p.

Research output: Contribution to journalArticle

softening
phonons
x ray scattering
analyzers
crystallinity
2003
6 Citations (Scopus)

A Raman scattering study of superconductivity in MgB2

Quilty, J. W., Lee, S., Yamamoto, A., Tajima, S. & Yamanaka, A., 2003 May, In : Physica C: Superconductivity and its Applications. 388-389, p. 131-132 2 p.

Research output: Contribution to journalArticle

Superconductivity
Raman scattering
superconductivity
Scattering
Polarization
199 Citations (Scopus)

Carbon-substituted MgB2 single crystals

Lee, S., Masui, T., Yamamoto, A., Uchiyama, H. & Tajima, S., 2003 Oct 1, In : Physica C: Superconductivity and its Applications. 397, 1-2, p. 7-13 7 p.

Research output: Contribution to journalArticle

Carbon
Single crystals
Crystals
electrical resistivity
carbon
31 Citations (Scopus)

Crystal growth and characterization of MgB2: The relation between structural and superconducting properties

Lee, S., Masui, T., Mori, H., Eltsev, Y., Yamamoto, A. & Tajima, S., 2003 Feb, In : Superconductor Science and Technology. 16, 2, p. 213-220 8 p.

Research output: Contribution to journalArticle

Crystallization
Crystal growth
crystal growth
Temperature

De Haas-van Alphen effect in single crystal MgB2

Carrington, A., Cooper, J. R., Hussey, N. E., Meeson, P. J., Yelland, E. A., Lee, S., Yamamoto, A. & Tajima, S., 2003 May, In : Physica C: Superconductivity and its Applications. 388-389, p. 105-106 2 p.

Research output: Contribution to journalArticle

Orbits
Single crystals
orbits
single crystals
elementary excitations

Determination of the Fermi Surface of [Formula presented] by the de Haas–van Alphen Effect

Carrington, A., Meeson, P. J., Cooper, J. R., Balicas, L., Hussey, N. E., Yelland, E. A., Lee, S., Yamamoto, A., Tajima, S., Kazakov, S. M. & Karpinski, J., 2003 Jul 17, In : Physical Review Letters. 91, 3

Research output: Contribution to journalArticle

Fermi surfaces
orbits
electrons
electronic structure
augmentation
59 Citations (Scopus)

Determination of the Fermi surface of MgB2 by the de Haas-van Alphen effect

Carrington, A., Meeson, P. J., Cooper, J. R., Balicas, L., Hussey, N. E., Yelland, E. A., Lee, S., Yamamoto, A., Tajima, S., Kazakov, S. M. & Karpinski, J., 2003 Jul 18, In : Physical Review Letters. 91, 3

Research output: Contribution to journalArticle

Fermi surfaces
electron phonon interactions
topology
electronic structure
orbits
19 Citations (Scopus)

Effect of heavy-ion irradiation on the pinning properties of MgB2

Chikumoto, N., Yamamoto, A., Konczykowski, M. & Murakami, M., 2003 May, In : Physica C: Superconductivity and its Applications. 388-389, p. 167-168 2 p.

Research output: Contribution to journalArticle

Heavy Ions
Ion bombardment
ion irradiation
Heavy ions
heavy ions
15 Citations (Scopus)

Electronic structure of B 2pσ and pπ states in MgB2, AlB2, and ZrB2 single crystals

Nakamura, J., Nasubida, S. Y., Kabasawa, E., Yamazaki, H., Yamada, N., Kuroki, K., Watanabe, M., Oguchi, T., Lee, S., Yamamoto, A., Tajima, S., Umeda, Y., Minakawa, S., Kimura, N., Aoki, H., Otani, S., Shin, S., Callcott, T. A., Ederer, D. L., Denlinger, J. D. & 1 others, Perera, R. C. C., 2003 Aug, In : Physical Review B - Condensed Matter and Materials Physics. 68, 6, p. 645151-645155 5 p., 064515.

Research output: Contribution to journalArticle

Electron correlations
Electronic structure
Single crystals
electronic structure
single crystals
5 Citations (Scopus)

Experimental study of electron-phonon interaction in MgB2

Tajima, S., Masui, T., Quilty, J., Lee, S., Yamamoto, A. & Yamanaka, A., 2003 May, In : Physica C: Superconductivity and its Applications. 388-389, p. 103-104 2 p.

Research output: Contribution to journalArticle

Electron-phonon interactions
electron phonon interactions
Superconductivity
Raman scattering
Boron
25 Citations (Scopus)

Features of the electron density in magnesium diboride: Reconstruction from X-ray diffraction data and comparison with TB-LMTO and FPLO calculations

Tsirelson, V., Stash, A., Kohout, M., Rosner, H., Mori, H., Sato, S., Lee, S., Yamamoto, A., Tajima, S. & Grin, Y., 2003 Oct 1, In : Acta Crystallographica Section B: Structural Science. 59, 5, p. 575-583 9 p.

Research output: Contribution to journalArticle

Orbital calculations
Tin
Carrier concentration
X ray diffraction
Atoms
2002
7 Citations (Scopus)

Crystal growth of Bi2Sr2Ca2Cu3O10+x and (Bi,Pb)2Sr2Ca2Cu3O10+x by the KCl flux method

Lee, S., Yamamoto, A. & Tajima, S., 2002 Sep, In : Journal of Materials Research. 17, 9, p. 2286-2293 8 p.

Research output: Contribution to journalArticle

Crystallization
Crystal growth
crystal growth
Fluxes
Crystals
6 Citations (Scopus)

De Haas–van Alphen Effect in Single Crystal [Formula presented]

Yelland, E. A., Cooper, J. R., Carrington, A., Hussey, N. E., Meeson, P. J., Lee, S., Yamamoto, A. & Tajima, S., 2002 Jan 1, In : Physical Review Letters. 88, 21, 1 p.

Research output: Contribution to journalArticle

single crystals
tubes
orbits
high temperature superconductors
Fermi surfaces
107 Citations (Scopus)

de Haas-van Alphen effect in single crystal MgB2

Yelland, E. A., Cooper, J. R., Carrington, A., Hussey, N. E., Meeson, P. J., Lee, S., Yamamoto, A. & Tajima, S., 2002 May 27, In : Physical Review Letters. 88, 21, p. 2170021-2170024 4 p.

Research output: Contribution to journalArticle

single crystals
electron tubes
tubes
orbits
high temperature superconductors
1 Citation (Scopus)

Effects of Zn substitution on the superconductivity and pseudogap in (formula presented) with various doping levels

Yamamoto, A., Minami, K., Hu, W. Z., Miyakita, A., Izumi, M. & Tajima, S., 2002 Jan 1, In : Physical Review B - Condensed Matter and Materials Physics. 65, 10, p. 1-7 7 p.

Research output: Contribution to journalArticle

Superconductivity
Substitution reactions
superconductivity
Doping (additives)
substitutes
33 Citations (Scopus)

Effects of Zn substitution on the superconductivity and pseudogap in HgBa2CuO4+δ with various doping levels

Yamamoto, A., Minami, K., Hu, W. Z., Miyakita, A., Izumi, M. & Tajima, S., 2002 Mar 1, In : Physical Review B - Condensed Matter and Materials Physics. 65, 10, p. 1045051-1045057 7 p., 104505.

Research output: Contribution to journalArticle

Superconductivity
Substitution reactions
superconductivity
Doping (additives)
substitutes

Electron density distribution in a single crystal of (formula presented) (formula presented)

Mori, H., Lee, S., Yamamoto, A., Tajima, S. & Sato, S., 2002 Jan 1, In : Physical Review B - Condensed Matter and Materials Physics. 65, 9, p. 1-4 4 p.

Research output: Contribution to journalArticle

Electronic density of states
density distribution
Single crystals
Atoms
single crystals
32 Citations (Scopus)

Electron density distribution in a single crystal of Mg1-xB2 [x=0.045(5)]

Mori, H., Lee, S., Yamamoto, A., Tajima, S. & Sato, S., 2002 Mar 1, In : Physical Review B - Condensed Matter and Materials Physics. 65, 9, p. 925071-925074 4 p., 092507.

Research output: Contribution to journalArticle

Electronic density of states
density distribution
Single crystals
Atoms
single crystals