Point-contact Andreev-reflection spectroscopy in anisotropic superconductors: The importance of directionality

被引：18

作者：

Daghero, D. ^{[1
]}

Tortello, M. ^{[1
]}

Pecchio, P. ^{[1
]}

Stepanov, V. A. ^{[2
]}

Gonnelli, R. S. ^{[1
]}

机构：

[1] Politecn Torino, Dipartimento Sci Applicata & Tecnol, I-10129 Turin, Italy

[2] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia

来源：

LOW TEMPERATURE PHYSICS | 2013年 / 39卷 / 03期

关键词：

SURFACE; GAPS; MGB2;

D O I：

10.1063/1.4794994

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Point-contact Andreev-reflection spectroscopy (PCARS) has demonstrated to be one of the most effective experimental tools for the investigation of fundamental properties of superconductors such as the superconducting gap and the electron-phonon (or, more generally, electron-boson) coupling. By reviewing relevant examples reported in literature and presenting new results, in this paper we show that when the direction of the interface with respect to the crystallographic axes can be controlled (as in single crystals and epitaxial films) PCARS can provide invaluable information about the anisotropy of the pairing wavefunction or-in the case of multiband superconductors-on the number, amplitude and symmetry of the energy gaps. Moreover, the analysis of PCARS results within a suitable 3D generalization of the BTK model allows obtaining qualitative information about the topology of the Fermi surface. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4794994]

引用

页码：199 / 210

页数：12

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