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

B. Fauqué, Xiaofeng Xu, A. F. Bangura, E. C. Hunter, Ayako Yamamoto, K. Behnia, A. Carrington, H. Takagi, N. E. Hussey, R. S. Perry

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The hyperkagome antiferromagnet Na4Ir3O8 represents the first genuine candidate for the realization of a three-dimensional quantum spin liquid. It can also be doped towards a metallic state, thus offering a rare opportunity to explore the nature of the metal-insulator transition in correlated, frustrated magnets. Here, we report thermodynamic and transport measurements in both metallic and weakly insulating single crystals down to 150 mK. While in the metallic sample the phonon thermal conductivity (κph) is almost in the boundary scattering regime, in the insulating sample, we find a large reduction κph over a very wide temperature range. This result can be ascribed to the scattering of phonons off the gapless magnetic excitations that are seen in the low-temperature specific heat. This works highlights the peculiarity of the metal-insulator transition in Na3+xIr3O8 and demonstrates the importance of the coupling between lattice and spin degrees of freedom in the presence of strong spin-orbit coupling.

Original languageEnglish
Article number075129
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number7
DOIs
Publication statusPublished - 2015 Feb 25
Externally publishedYes

Fingerprint

Metal insulator transition
Thermal conductivity
thermal conductivity
insulators
Scattering
Crystalline materials
Phonons
metals
Specific heat
Magnets
Orbits
Single crystals
Thermodynamics
scattering
Temperature
Liquids
phonons
magnets
degrees of freedom
specific heat

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3 O8. / Fauqué, B.; Xu, Xiaofeng; Bangura, A. F.; Hunter, E. C.; Yamamoto, Ayako; Behnia, K.; Carrington, A.; Takagi, H.; Hussey, N. E.; Perry, R. S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 91, No. 7, 075129, 25.02.2015.

Research output: Contribution to journalArticle

Fauqué, B. ; Xu, Xiaofeng ; Bangura, A. F. ; Hunter, E. C. ; Yamamoto, Ayako ; Behnia, K. ; Carrington, A. ; Takagi, H. ; Hussey, N. E. ; Perry, R. S. / Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3 O8. In: Physical Review B - Condensed Matter and Materials Physics. 2015 ; Vol. 91, No. 7.
@article{26025ab29929466caad1ea8d03ce07db,
title = "Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3 O8",
abstract = "The hyperkagome antiferromagnet Na4Ir3O8 represents the first genuine candidate for the realization of a three-dimensional quantum spin liquid. It can also be doped towards a metallic state, thus offering a rare opportunity to explore the nature of the metal-insulator transition in correlated, frustrated magnets. Here, we report thermodynamic and transport measurements in both metallic and weakly insulating single crystals down to 150 mK. While in the metallic sample the phonon thermal conductivity (κph) is almost in the boundary scattering regime, in the insulating sample, we find a large reduction κph over a very wide temperature range. This result can be ascribed to the scattering of phonons off the gapless magnetic excitations that are seen in the low-temperature specific heat. This works highlights the peculiarity of the metal-insulator transition in Na3+xIr3O8 and demonstrates the importance of the coupling between lattice and spin degrees of freedom in the presence of strong spin-orbit coupling.",
author = "B. Fauqu{\'e} and Xiaofeng Xu and Bangura, {A. F.} and Hunter, {E. C.} and Ayako Yamamoto and K. Behnia and A. Carrington and H. Takagi and Hussey, {N. E.} and Perry, {R. S.}",
year = "2015",
month = "2",
day = "25",
doi = "10.1103/PhysRevB.91.075129",
language = "English",
volume = "91",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

TY - JOUR

T1 - Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3 O8

AU - Fauqué, B.

AU - Xu, Xiaofeng

AU - Bangura, A. F.

AU - Hunter, E. C.

AU - Yamamoto, Ayako

AU - Behnia, K.

AU - Carrington, A.

AU - Takagi, H.

AU - Hussey, N. E.

AU - Perry, R. S.

PY - 2015/2/25

Y1 - 2015/2/25

N2 - The hyperkagome antiferromagnet Na4Ir3O8 represents the first genuine candidate for the realization of a three-dimensional quantum spin liquid. It can also be doped towards a metallic state, thus offering a rare opportunity to explore the nature of the metal-insulator transition in correlated, frustrated magnets. Here, we report thermodynamic and transport measurements in both metallic and weakly insulating single crystals down to 150 mK. While in the metallic sample the phonon thermal conductivity (κph) is almost in the boundary scattering regime, in the insulating sample, we find a large reduction κph over a very wide temperature range. This result can be ascribed to the scattering of phonons off the gapless magnetic excitations that are seen in the low-temperature specific heat. This works highlights the peculiarity of the metal-insulator transition in Na3+xIr3O8 and demonstrates the importance of the coupling between lattice and spin degrees of freedom in the presence of strong spin-orbit coupling.

AB - The hyperkagome antiferromagnet Na4Ir3O8 represents the first genuine candidate for the realization of a three-dimensional quantum spin liquid. It can also be doped towards a metallic state, thus offering a rare opportunity to explore the nature of the metal-insulator transition in correlated, frustrated magnets. Here, we report thermodynamic and transport measurements in both metallic and weakly insulating single crystals down to 150 mK. While in the metallic sample the phonon thermal conductivity (κph) is almost in the boundary scattering regime, in the insulating sample, we find a large reduction κph over a very wide temperature range. This result can be ascribed to the scattering of phonons off the gapless magnetic excitations that are seen in the low-temperature specific heat. This works highlights the peculiarity of the metal-insulator transition in Na3+xIr3O8 and demonstrates the importance of the coupling between lattice and spin degrees of freedom in the presence of strong spin-orbit coupling.

UR - http://www.scopus.com/inward/record.url?scp=84924037980&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84924037980&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.91.075129

DO - 10.1103/PhysRevB.91.075129

M3 - Article

AN - SCOPUS:84924037980

VL - 91

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 7

M1 - 075129

ER -