Physical properties of KxNi2-ySe2 single crystals

Hechang Lei; Kefeng Wang; Hyejin Ryu; D. Graf; J. B. Warren; C. Petrovic

Physical properties of KxNi2-ySe2 single crystals

Superconductivity 2012-11-07 v1

Authors: Hechang Lei , Kefeng Wang , Hyejin Ryu , D. Graf , J. B. Warren , C. Petrovic

Abstract

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.

Keywords

KxNi2-ySe2 single crystals superconductivity absence Fermi liquid heavy-fermion behavior charge density wave magnetic susceptibility

Cite

@article{arxiv.1211.1371,
  title  = {Physical properties of KxNi2-ySe2 single crystals},
  author = {Hechang Lei and Kefeng Wang and Hyejin Ryu and D. Graf and J. B. Warren and C. Petrovic},
  journal= {arXiv preprint arXiv:1211.1371},
  year   = {2012}
}

Comments

6 pages, 6 figures

Physical properties of KxNi2-ySe2 single crystals

Abstract

Keywords

Cite

Comments

Related papers