title: Giant Isotropic Nernst Effect in an Anisotropic Kondo Semimetal.
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.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Ulrike
authors.initials: U
authors.lastname: Stockert
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Peijie
authors.initials: P
authors.lastname: Sun
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Niels
authors.initials: N
authors.lastname: Oeschler
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Steglich
authors.affiliation: Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Toshiro
authors.initials: T
authors.lastname: Takabatake
authors.affiliation: Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08855, USA.|Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom.
authors.forename: Piers
authors.initials: P
authors.lastname: Coleman
authors.affiliation: Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040 Vienna, Austria.
authors.forename: Silke
authors.initials: S
authors.lastname: Paschen