Tunneling spectroscopy of the normal-state gap in (Bi, Ph)2Sr2Ca2Cu3O10+δ -: art. no. 092510

被引:28
作者
Ekino, T [1 ]
Hashimoto, S
Takasaki, T
Fujii, H
机构
[1] Hiroshima Univ, Fac Integrated Arts & Sci, Higashihiroshima 7398521, Japan
[2] Hiroshima Univ, Grad Sch Adv Sci Matter, Dept Quantum Matter, Higashihiroshima 7398521, Japan
关键词
D O I
10.1103/PhysRevB.64.092510
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Tunneling spectra have been measured on as-grown (Bi, Pb)(2)Sr2CaCu3O10+delta with T-c = 110 K using a ceramic break junction. The superconducting-gap size is in scale with that of as-grown Bi2Sr2CaCu2O8+delta (T-c = 86 K). The closing temperatures T* of the normal-state gap are found to be approximate to 170 and approximate to 250 K. which are similar to T* of Bi2212. The tunneling conductance displays a distinction between the superconducting gap and the normal-state gap around T-c. Near room temperature, the zero-bias conductance enhancement is observed, which could reflect the energy-gap spectrum with a different conduction mechanism from tunneling (e.g., the Andreev scattering).
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页数:4
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