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Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3O8

Fauque, B; Xu, X; Bangura, AF; Hunter, EC; Yamamoto, A; Behnia, K; Carrington, A; ... Perry, RS; + view all (2015) Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3O8. Physical Review B , 91 (7) , Article 075129. 10.1103/PhysRevB.91.075129. Green open access

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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.

Type: Article
Title: Thermal conductivity across the metal-insulator transition in the single-crystalline hyperkagome antiferromagnet Na3+xIr3O8
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.91.075129
Publisher version: http://dx.doi.org/10.1103/PhysRevB.91.075129
Language: English
Additional information: Copyright © 2015 American Physical Society.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1465524
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