Intrinsic Josephson junction behaviour of the low Tc superconductor (LaSe)1.14(NbSe2)

被引：3
|
作者：
Kacmarcik, J.
Szabo, P.
Samuely, P. [1 ]
Rodrigo, J. G. [2 ]
Suderow, H. [2 ]
Vieira, S. [2 ]
Lafond, A. [3 ]
Meerschaut, A. [3 ]
机构：
[1] Slovak Acad Sci, Inst Expt Phys, Ctr Low Temp Phys, SK-04001 Kosice, Slovakia
[2] Univ Autonoma Madrid, Lab Bajas Temp, Dpto Fis Mat Condensada, Inst Ciencia Mat Nicolas Cabrera, E-28049 Madrid, Spain
[3] Univ Nantes, Chim Solide Lab, Inst Mat Jean Rouxel, UMR CNRS 6502, F-44322 Nantes, France
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2008年 / 468卷 / 7-10期
关键词：
intrinsic Josephson junction; STM/STS; electron transport;
D O I：
10.1016/j.physc.2007.11.062
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Interlayer magnetotransport measurements on the highly anisotropic (LaSe)(1.14)(NbSe2) superconductor with T-c similar to 1.2 K have indicated that this layered compound represents a model system of intrinsic Josephson junctions [P. Szabo et al., Phys. Rev. Lett. 86 (2001) 5990]. Scanning tunneling microscopy at room temperature and tunneling spectroscopy measurements at very low temperatures are presented in this work. STM imaging has revealed the presence of two types of surfaces which can be attributed to the appearance of LaSe or NbSe2 layers on the surface. The use of STM tip made of superconducting lead enabled a precise measurement of the temperature dependence of the superconducting energy gap Delta(T) on the NbSe2 layer. Delta(T) obtained from the surface sensitive STS data support the scenario obtained from our previous interlayer - ergo bulk sensitive magnetotransport measurements. (c) 2008 Elsevier B.V. All rights reserved.
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页码：543 / 546
页数：4
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