Vacuum tunneling spectroscopy of high-temperature superconductors: A critical study

被引：33

作者：

Mallet, P ^{[1
]}

Roditchev, D ^{[1
]}

Sacks, W ^{[1
]}

Defourneau, D ^{[1
]}

Klein, J ^{[1
]}

机构：

[1] UNIV PARIS 07,PHYS SOLIDES GRP,CNRS,F-75251 PARIS,FRANCE

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.54.13324

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using scanning tunneling spectroscopy (STS) the local density of states (LDOS) of Bi2Sr2Ca1Cu2O8+delta [Bi(2212)] and Y1Ba2Cu3O7-delta (YBaCuO) monocrystals were studied at low temperature (down to 4.2 K). Due to the high quality of the vacuum tunneling junctions the pair-breaking effects are consequently reduced, and rather fine features of the superconducting LDOS could be analyzed. For Bi(2212) it is shown that, in order to fit properly the experimental data, d(x2-y2) pairing (or a very anisotropic s pairing) as well as a strong in-plane anisotropy of the Fermi surface are required. Although YBaCuO STS spectra look more ''d like,'' no precise analysis was possible because of the high natural surface contamination of the samples. Both the fundamental problem of pairing symmetry and the influence of experimental conditions on vacuum STS measurements are discussed.

引用

页码：13324 / 13329

页数：6

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