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Physical properties of KxNi2-ySe2 single crystals

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arxiv 1211.1371 v1 pith:XNF4TBGD submitted 2012-11-06 cond-mat.supr-con

Physical properties of KxNi2-ySe2 single crystals

classification cond-mat.supr-con
keywords crystalssingledensitykni2se2physicalpolycrystalsstateabsent
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have synthesized K0.95(1)Ni1.86(2)Se2 single crystals. The single crystals contain K and Ni deficiencies not observed in KNi2Se2 polycrystals. Unlike KNi2Se2 polycrystals, the superconductivity is absent in single crystals. The detailed physical property study indicates that the K0.95Ni1.86Se2 single crystals exhibit Fermi liquid behavior with heavy-fermion-like characteristics. Transition from the high temperature local charge density wave state to heavy fermion state below T ~ 30 K results in an enhancement of electron-like carrier density whereas magnetic susceptibility shows little anisotropy and suggests presence of both itinerant and localized Ni orbitals.

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