TUNNELING EVIDENCE FOR THE QUASI-PARTICLE GAP IN KONDO SEMICONDUCTORS CENISN AND CERHSB

被引:112
作者
EKINO, T [1 ]
TAKABATAKE, T [1 ]
TANAKA, H [1 ]
FUJII, H [1 ]
机构
[1] HIROSHIMA UNIV,FAC INTEGRATED ARTS & SCI,HIGASHIHIROSHIMA 739,JAPAN
关键词
D O I
10.1103/PhysRevLett.75.4262
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The Kondo semiconductors CeNiSn and CeRhSb were investigated by tunneling spectroscopy using a break junction. The differential conductances at 2-4 K show energy gaps of 8-10 and 20-27 meV for CeNiSn and CeRhSb, respectively, which are comparable to the Kondo temperatures. The tunneling spectra give clear evidence for a strong gap anisotropy. With increasing temperature, the zero-bias conductance displays a crossover from a well-developed gap state to a partial-gap state, and to a Kondo-metallic state.
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页码:4262 / 4265
页数:4
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