• 3801 Citations
  • 36 h-Index
1987 …2020

Research output per year

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Research Output

1987

Crystal Chemistry of Oxide Superconductors - Synthesis and Properties of (Y,La,Ba)3Cu3Oy Pseudo-ternary System

Tokiwa, A., Kikuch], M., Syono, Y., Nakatsu, O., Kobayashi, N. & Muto, Y., 1987, In : Journal of the Japan Society of Powder and Powder Metallurgy. 34, 10, p. 559-562 4 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Crystallochemical aspect of high temperature superconducting oxides

Syono, Y., Kikuchi, M., Oh-Ishi, K., Tokiwa, A., Kusaba, K., Hiraga, K., Kajitani, T., Shindo, D., Yamauchi, H., Morioka, Y., Arai, H., Nagase, K., Kobayashi, N., Sasaoka, T. & Muto, Y., 1987 Dec, In : Physica B+C. 148, 1-3, p. 218-223 6 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Effect of Co Substitution on Tc in YBa2Cu3-xCoxO7-y,(x=0-1)

Shindo, D., Hiraga, K., Hirabayashi, M., Tokiwa, A., Kikuchi, M., Syono, Y., Nakatsu, O., Kobayashi, N., Muto, Y. & Aoyagi, E., 1987 Oct, In : Japanese Journal of Applied Physics. 26, 10 A, p. L1667-L1669

Research output: Contribution to journalArticle

38 Citations (Scopus)

FAR-INFRARED ABSORPTION BY SMALL PARTICLES OF YBa//2Cu//3O//6//. //7//4.

Kuroda, N., Chida, F., Sasaki, Y., Nishina, Y., Kikuchi, M., Tokiwa, A. & Syono, Y., 1987 Dec 1, In : Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics. 148, 1-3, p. 529-530 2 p.

Research output: Contribution to journalConference article

Far-Infrared Absorption by Small Particles of YBa2Cu3O6.74

Kuroda, N., Chida, F., Sasaki, Y., Nishina, Y., Kikuchi, M., Tokiwa, A. & Syono, Y., 1987 Jan 1, In : Journal of the Physical Society of Japan. 56, 11, p. 3797-3800 4 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Mixed Ruthenium-rhodium Trinuclear Complex [Ru2Rh(m3-oo)(ai-CH3COO)6(L)3]+(L = H2O or Pyridine)

Sasaki, Y., Tokiwa, A. & Ito, T., 1987 Oct 1, In : Journal of the American Chemical Society. 109, 21, p. 6341-6347 7 p.

Research output: Contribution to journalArticle

61 Citations (Scopus)

Superconducting properties of the high-Tc oxide compounds

Kobayashi, N., Nakatsu, O., Terada, S., Sasaoka, T., Sasaki, T., Furuyama, M., Noto, K., Kikichi, M., Tokiwa, A., Oh-Ishi, K., Syono, Y. & Muto, Y., 1987 Dec, In : Physica B+C. 148, 1-3, p. 469-471 3 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Thermal and x-ray analyses of high temperature superconductor YBa2Cu3O6.74

Kikuchi, M., Syono, Y., Tokiwa, A., Oh-Ishi, K., Arai, H., Hiraga, K., Kobayashi, N. & Sasaoka, T., 1987 Jun, In : Japanese Journal of Applied Physics. 26, 6A, p. 1066-1099 34 p.

Research output: Contribution to journalArticle

56 Citations (Scopus)
1988

An x-ray diffraction and electron microscopic study of a new high-Tcsuperconductor based on the Bi-Ca-Sr-Cu-O system

Syono, Y., Hiraga, K., Kobayashi, N., Kikuchi, M., Kusaba, K., Kajitani, T., Shindo, D., Hosoya, S., Tokiwa, A., Terada, S. & Muto, Y., 1988 Apr, In : Japanese Journal of Applied Physics. 27, 4A, p. L569-L572

Research output: Contribution to journalArticle

53 Citations (Scopus)

Bis(μ-acetato)(μ-oxo)bis(tris (pyridine)ruthenium(III)) Ion: A ruthenium analogue of the hemerythrin active center

Sasaki, Y., Suzuki, M., Tokiwa, A., Ebihara, M., Yamaguchi, T., Kabuto, C. & Ito, T., 1988 Aug, In : Journal of the American Chemical Society. 110, 18, p. 6251-6252 2 p.

Research output: Contribution to journalArticle

51 Citations (Scopus)

Crystal structure and superconductivity controlled by cation substitution and oxygen annealing in y1-xcaxba2cu3oyand yba2-xlaxcu3oy

Tokiwa, A., Syono, Y., Kikuchi, M., Suzuki, R., Kajitani, T., Kobayashi, N., Sasaki, T., Nakatsu, O. & Muto, Y., 1988 Jun, In : Japanese Journal of Applied Physics. 27, 6A, p. L1009-L1012

Research output: Contribution to journalArticle

76 Citations (Scopus)

Raman spectra of YBa2Cu3-xMxOy(M=Co, Ni) superconductors

Morioka, Y., Tokiwa, A., Kikuchi, M. & Syono, Y., 1988 Jul, In : Solid State Communications. 67, 3, p. 267-269 3 p.

Research output: Contribution to journalArticle

10 Citations (Scopus)

Specific heat of YBa2Cu3O7-δ and BaCuO2+x in magnetic fields up to 6 T

Sasaki, T., Nakatsu, O., Kobayashi, N., Tokiwa, A., Kikuchi, M., Liu, A., Hiraga, K., Syono, Y. & Muto, Y., 1988 Oct 1, In : Physica C: Superconductivity and its applications. 156, 3, p. 395-404 10 p.

Research output: Contribution to journalArticle

28 Citations (Scopus)

Specific heat of YBa2Cu3O7-δ in magnetic fields up to 6T

Sasaki, T., Kobayashi, N., Nakatsu, O., Matsuhira, T., Tokiwa, A., Kikuchi, M., Syono, Y. & Muto, Y., 1988, In : Physica C: Superconductivity and its applications. 153-155, PART 2, p. 1012-1013 2 p.

Research output: Contribution to journalArticle

14 Citations (Scopus)

Synthesis and superconductivity of a new high-TcTl-Ba-Ca-Cu-O phase

Kikuchi, M., Kobayashi, N., Iwasaki, H., Shindo, D., Oku, T., Tokiwa, A., Kajitani, T., Hiraga, K., Syono, Y. & Muto, Y., 1988 Jun, In : Japanese Journal of Applied Physics. 27, 6A, p. L1050-L1053

Research output: Contribution to journalArticle

18 Citations (Scopus)

Upper and lower critical fields of REBa2Cu3Oz compounds

Kobayashi, N., Iwasaki, H., Terada, S., Noto, K., Tokiwa, A., Kikuchi, M., Syono, Y. & Muto, Y., 1988, In : Physica C: Superconductivity and its applications. 153-155, p. 1525-1526 2 p.

Research output: Contribution to journalArticle

19 Citations (Scopus)
1989

Crystal structure and phase transition of PbBaSrYCu3Oy(y=7∼8.4

Tokiwa, A., Oku, T., Nagoshi, M., Kikuchi, M., Hiraga, K. & Syono, Y., 1989 Dec 1, In : Physica C: Superconductivity and its applications. 161, 4, p. 459-467 9 p.

Research output: Contribution to journalArticle

56 Citations (Scopus)

Electron energy loss spectroscopy on oxygen k-edge fine structure of YBa2Cu3Oycontaining dopants (La, Ca, Co)

Shindo, D., Hiraga, K., Tokiwa, A., Soga, T., Hojou, K., Furuno, S., Otsu, H., Nakajima, S., Hirabayashi, M., Kikuchi, M. & Syono, Y., 1989 Jul, In : Japanese Journal of Applied Physics. 28, 7 A, p. L1197-L1200

Research output: Contribution to journalArticle

2 Citations (Scopus)

Raman spectra of YBa2Cu3Ox (x=6-7)

Morioka, Y., Tokiwa, A., Kikuchi, M., Syono, Y. & Nagase, K., 1989 Jun, In : Solid State Communications. 70, 12, p. 1127-1129 3 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)
1990

CORRECTION

Yamamoto, A., 1990, In : Physica C.

Research output: Contribution to journalArticle

Different origins of Tc-suppression in YBa2(Cu1−xMx)3Oy(M=Co and Zn)

Terada, S., Kobayashi, N., Iwasaki, H., Tokiwa, A., Kikuchi, M., Syono, Y. & Muto, Y., 1990, In : Physica B: Condensed Matter. 165-166, p. 1545-1546 2 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Proper composition for superconductivity in Pb(Ba, Sr)2(Y, Ca)Cu3O7

Tokiwa, A., Nagoshi, M. & Syono, Y., 1990 Oct 1, In : Physica C: Superconductivity and its applications. 170, 5-6, p. 437-442 6 p.

Research output: Contribution to journalArticle

13 Citations (Scopus)

Shock-induced superconductivity of Tl2Ba2CuO 6

Kikuchi, M., Syono, Y., Kobayashi, N., Oku, T., Aoyagi, E., Hiraga, K., Kusaba, K., Atou, T., Tokiwa, A., Fukuoka, K. & Nakajima, S., 1990 Dec 1, In : Applied Physics Letters. 57, 8, p. 813-815 3 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Synthesis and crystal structure of Pb (Ba,Sr)2(Ln,Ce)2Cu3Oy (Ln: lanthanoid, y=9-10.4), a new member of the Pb system

Tokiwa, A., Oku, T., Nagoshi, M., Shindo, D., Kikuchi, M., Oikawa, T., Hiraga, K. & Syono, Y., 1990 Dec 1, In : Physica C: Superconductivity and its applications. 172, 1-2, p. 155-165 11 p.

Research output: Contribution to journalArticle

26 Citations (Scopus)

Synthesis and superconductivity of PbBaSrY1-xCaxCu3O7

Tokiwa, A., Nagoshi, M., Oku, T., Kobayashi, N., Kikuchi, M., Hiraga, K. & Syono, Y., 1990 Jun 15, In : Physica C: Superconductivity and its applications. 168, 3-4, p. 285-290 6 p.

Research output: Contribution to journalArticle

34 Citations (Scopus)
1991

Changes in modulation period of Bi2Sr2 (Ca1-xNdx) Cu2Oa + δ and their relations to oxygen content

Onozuka, T., Tokiwa, A., Syono, Y., Koike, Y. & Saito, Y., 1991 Dec 1, In : Physica C: Superconductivity and its applications. 185-189, PART 2, p. 885-886 2 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Chemistry of superconducting Cu oxides with the block layers consisting of Tl, Pb and Bi ions

Syono, Y., Kikuchi, M., Nakajima, S. & Tokiwa, A., 1991 Dec 2, In : Physica C: Superconductivity and its applications. 190, 1-2, p. 9-13 5 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Kinetic analysis of superconducting YBa2O7, by thermogravimetry in high vacuum

Nagase, K., Yokobayashi, H., Kikuchi, M., Tokiwa, A., Syono, Y. & Morioka, Y., 1991 Mar 15, In : Thermochimica Acta. 175, 2, p. 207-213 7 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Local structure and valence states in PbBaSrY1-xCaxCu3O7+δ and Pb2Sr2Y1-xCaxCu3O8+δ

Yamaguchi, H., Oyanagi, H., Tokiwa, A. & Syono, Y., 1991 Dec 1, In : Physica C: Superconductivity and its applications. 185-189, PART 2, p. 853-854 2 p.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Oxygen-loss effects on superconductivity of Bi2Sr2CaCu2Oy system

Nagoshi, M., Suzuki, T., Fukuda, Y., Terashima, K., Nakanishi, Y., Ogita, M., Tokiwa, A., Syono, Y. & Tachiki, M., 1991 Jan 1, In : Physical Review B. 43, 13, p. 10445-10450 6 p.

Research output: Contribution to journalArticle

76 Citations (Scopus)

Photoemission study on Ba1-xKxBiO3-δ and BaPbxBi1-δO3-δ

Nagoshi, M., Fukuda, Y., Suzuki, T., Ueki, K., Tokiwa, A., Kikuchi, M., Syono, Y. & Tachiki, M., 1991 Dec 1, In : Physica C: Superconductivity and its applications. 185-189, PART 2, p. 1051-1052 2 p.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Preparation, Structure, and Properties of the Bis(μ-acetato)(μ-oxo)Ruthenium(III) Dimers [Ru2(μ-CH3COO)2(μ-O)(py)6]2+ and [Ru2(μ-CH3COO)2(μ-O)(bpy)2(py)2]2+

Sasaki, Y., Suzuki, M., Yamaguchi, T., Kabuto, C., Ochi, T., Ito, T., Nagasawa, A., Tokiwa, A. & Ebihara, M., 1991 Dec 1, In : Inorganic Chemistry. 30, 26, p. 4903-4908 6 p.

Research output: Contribution to journalArticle

65 Citations (Scopus)

Superconductivity and crystal structure of Pb(Ba,Sr)2(Ln,Ca)Cu3Oy and Pb(Ba,Sr)2(Ln,Ce)2Cu3Oy(Ln: lanthanoid) with (Pb,Cu) double layers

Tokiwa, A., Syono, Y., Oku, T. & Nagoshi, M., 1991 Dec 1, In : Physica C: Superconductivity and its applications. 185-189, PART 1, p. 619-620 2 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)
39 Citations (Scopus)
1992

Electronic states of BaBiO3- delta and K-doping effects studied by photoelectron spectroscopy

Nagoshi, M., Suzuki, T., Fukuda, Y., Ueki, K., Tokiwa, A., Kiruchi, M., Syono, Y. & Tachiki, M., 1992 Dec 1, In : Journal of Physics: Condensed Matter. 4, 26, p. 5769-5781 13 p., 011.

Research output: Contribution to journalArticle

42 Citations (Scopus)

X-ray absorption study on PbBaSrYCu3O7+Δ and PbBaSr(Y,Ca)Cu3Cu3O7+Δ

Yamaguchi, H., Yanagi, H., Tokiwa, A. & Shono, Y., 1992 Apr, In : Ferroelectrics. 128, 1, p. 191-196 6 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)
1993

Annealing effects on the Meissner signals from HgBaCaCuO superconductors

Adachi, S., Tokiwa-Yamamoto, A., Itoh, M., Isawa, K. & Yamauchi, H., 1993 Sep 10, In : Physica C: Superconductivity and its applications. 214, 3-4, p. 313-315 3 p.

Research output: Contribution to journalArticle

26 Citations (Scopus)

Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors

Tokiwa-Yamamoto, A., Isawa, K., Itoh, M., Adachi, S. & Yamauchi, H., 1993 Nov 1, In : Physica C: Superconductivity and its applications. 216, 3-4, p. 250-256 7 p.

Research output: Contribution to journalArticle

44 Citations (Scopus)

Disordering of Pb and Cu arrangements in the block layers of Pb2Sr2YCu3O8+δ and PbBaSrYCu3O7+δ by oxygen introduction

Tokiwa-Yamamoto, A., Izumi, F., Oku, T. & Syono, Y., 1993 Oct 1, In : Physica C: Superconductivity and its applications. 215, 3-4, p. 243-252 10 p.

Research output: Contribution to journalArticle

10 Citations (Scopus)

Increase of Tc in HgBa2CuOy by reducing treatment

Itoh, M., Tokiwa-Yamamoto, A., Adachi, S. & Yamauchi, H., 1993 Jul 15, In : Physica C: Superconductivity and its applications. 212, 3-4, p. 271-273 3 p.

Research output: Contribution to journalArticle

47 Citations (Scopus)

Large enhancement of Tc in the 134 K superconductor HgBa2Ca2Cu3Oy under high pressure

Takahashi, H., Tokiwa-Yamamoto, A., Môri, N., Adachi, S., Yamauchi, H. & Tanaka, S., 1993 Dec 1, In : Physica C: Superconductivity and its applications. 218, 1-2, p. 1-4 4 p.

Research output: Contribution to journalArticle

43 Citations (Scopus)

MIXED CHROMIUM(III)-RUTHENIUM(III) TRINUCLEAR COMPLEX, CRRU2(MU-3-O)(MU-CH3COO)6(PYRIDINE)3 +

Yamamoto, A., Sasaki, Y., Yoshida, Y. & Ohto, A., 1993, In : Chemistry Letters Issue.

Research output: Contribution to journalArticle

O1s core levels of Bi-Sr-Ca-Cu-O superconductors studied by X-ray photoelectron spectroscopy

Nagoshi, M., Fukuda, Y., Sanada, N., Syono, Y., Tokiwa-Yamamoto, A. & Tachiki, M., 1993 Feb 26, In : Journal of Electron Spectroscopy and Related Phenomena. 61, 3-4, p. 309-322 14 p.

Research output: Contribution to journalArticle

10 Citations (Scopus)

Substitution of methanol-d4 for the coordinated water in the trinuclear complexes, [M33-O)(μ-CH3COO)6(H2O)3]+ (M3=Ru3, Rh3 or Ru2Rh) in methanol-d4

Sasaki, Y., Nagasawa, A., Tokiwa-Yamamoto, A. & Ito, T., 1993 Oct, In : Inorganica Chimica Acta. 212, 1-2, p. 175-182 8 p.

Research output: Contribution to journalArticle

38 Citations (Scopus)

The effect of Pb doping in HgBa2Ca2Cu3O8+δ superconductor

Isawa, K., Tokiwa-Yamamoto, A., Itoh, M., Adachi, S. & Yamauchi, H., 1993 Nov 10, In : Physica C: Superconductivity and its applications. 217, 1-2, p. 11-15 5 p.

Research output: Contribution to journalArticle

68 Citations (Scopus)

Valence states of BaBi1-xPbxO3-δ (0≤x≤1) studied by photoelectron spectroscopy

Nagoshi, M., Suzuki, T., Fukuda, Y., Tokiwa-Yamamoto, A., Syono, Y. & Tachiki, M., 1993 Jan 1, In : Physical Review B. 47, 9, p. 5196-5201 6 p.

Research output: Contribution to journalArticle

11 Citations (Scopus)
1994

Doping states of Hg-based superconducting cuprates

Adachi, S., Tokiwa-Yamamoto, A., Itoh, M., Isawa, K., Yamauchi, H., Takahashi, H. & Mori, N., 1994 Dec 1, In : Denshi Gijutsu Sogo Kenkyusho Iho/Bulletin of the Electrotechnical Laboratory. 58, 6, p. 80-83 4 p.

Research output: Contribution to journalConference article

Encapsulation method for the synthesis of nearly single-phase superconducting HgBa2Ca2Cu3O8+δ with Tc≥ 135 K

Isawa, K., Tokiwa-Yamamoto, A., Itoh, M., Adachi, S. & Yamauchi, H., 1994 Mar 10, In : Physica C: Superconductivity and its applications. 222, 1-2, p. 33-37 5 p.

Research output: Contribution to journalArticle

71 Citations (Scopus)