Manifestations of fine features of the density of states in the transport properties of KOs2O6

被引:2
|
作者
Akrap, A. [1 ]
Tutis, E.
Kazakov, S. M.
Zhigadlo, N. D.
Karpinski, J.
Forro, L.
机构
[1] Ecole Polytech Fed Lausanne, Inst Phys Mat Compelxe, CH-1015 Lausanne, Switzerland
[2] Inst Fiz, Zagreb 10000, Croatia
[3] Swiss Fed Inst Technol, Lab Solid State Phys, CH-8093 Zurich, Switzerland
[4] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia
关键词
D O I
10.1103/PhysRevB.75.172501
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We performed high-pressure transport measurements on high-quality single crystals of KOs2O6, a beta-pyrochlore superconductor. While the resistivity at high temperatures might approach saturation, there is no sign of saturation at low temperatures, down to the superconducting phase. The anomalous resistivity is accompanied by a nonmetallic behavior in the thermoelectric power (TEP) up to temperatures of at least 700 K, which also exhibits a broad hump with a maximum at 60 K. The pressure influences mostly the low-energy electronic excitations. A simple band model based on enhanced density of states in a narrow window around the Fermi energy (E-F) explains the main features of this unconventional behavior in the transport coefficients and its evolution under pressure.
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页数:4
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