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Giant Isotropic Nernst Effect in an Anisotropic Kondo Semimetal

MPS-Authors
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Stockert,  Ulrike
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sun,  Peijie
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Oeschler,  Niels
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  Frank
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Stockert, U., Sun, P., Oeschler, N., Steglich, F., Takabatake, T., Coleman, P., et al. (2016). Giant Isotropic Nernst Effect in an Anisotropic Kondo Semimetal. Physical Review Letters, 117(21): 216401, pp. 1-5. doi:10.1103/PhysRevLett.117.216401.


Cite as: http://hdl.handle.net/21.11116/0000-0001-5284-D
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.