Giant isotropic Nernst effect in an anisotropic Kondo semimetal

Ulrike Stockert, Peijie Sun, Niels Oeschler, Frank Steglich, Toshiro Takabatake, Piers Coleman, Silke Paschen

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The "failed Kondo insulator" CeNiSn has long been suspected to be a nodal metal, with a node in the hybridization matrix elements. Here we carry out a series of Nernst effect experiments to delineate whether the severely anisotropic magnetotransport coefficients do indeed derive from a nodal metal or can simply be explained by a highly anisotropic Fermi surface. Our experiments reveal that despite an almost twentyfold anisotropy in the Hall conductivity, the large Nernst signal is isotropic. Taken in conjunction with the magnetotransport anisotropy, these results provide strong support for an isotropic Fermi surface with a large anisotropy in quasiparticle mass derived from a nodal hybridization.

Original languageEnglish (US)
Article number216401
JournalPhysical review letters
Volume117
Issue number21
DOIs
StatePublished - Nov 14 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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