Influence of linear-energy-dependent density of states on two-band superconductors: Three-square-well model approach

被引：4
作者：
Ogbuu, O. A. [1 ]
Abah, O. C. [1 ]
Asomba, G. C. [1 ]
Okoye, C. M. I. [1 ]
机构：
[1] Univ Nigeria, Dept Phys & Astron, Nsukka, Nigeria
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2011年 / 471卷 / 15-16期
关键词：
High-T-c superconductors; Energy-dependent density of states; Three-square-well potentials; T-C SUPERCONDUCTORS; ISOTOPE; MGB2; PHONON; EXPONENT;
D O I：
10.1016/j.physc.2011.04.014
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have derived the expressions for the transition temperature and the isotope effect exponent within the framework of Bogoliubov-Valatin two-band formalism using a linear-energy-dependent electronic density of states assuming a three-square-well potentials model. Our results show that the approach could be used to account for a wide range of values of the transition temperature and isotope effect exponent. The relevance of the present calculations to MgB2 is analyzed. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：444 / 448
页数：5
相关论文
共 57 条
[1]   The effect of interband interactions of phonon and charge fluctuation on the superconducting parameters of MgB2 [J].
Abah, O. C. ;
Asomba, G. C. ;
Okoye, C. M. I. .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2010, 23 (04)
[2]   Interband interactions and three-square-well potentials on the superconductivity of MgB2 [J].
Abah, Obinna C. ;
Asomba, G. C. ;
Okoye, C. M. I. .
SOLID STATE COMMUNICATIONS, 2009, 149 (37-38) :1510-1513
[3]   PENETRATION DEPTH IN LAYERED SUPERCONDUCTORS - APPLICATION TO THE CUPRATES AND CONVENTIONAL MULTILAYERS [J].
ADRIAN, SD ;
REEVES, ME ;
WOLF, SA ;
KRESIN, VZ .
PHYSICAL REVIEW B, 1995, 51 (10) :6800-6803
[4]   THEORY OF SUPERCONDUCTIVITY [J].
BARDEEN, J ;
COOPER, LN ;
SCHRIEFFER, JR .
PHYSICAL REVIEW, 1957, 108 (05) :1175-1204
[5]   ISOTOPE EFFECT IN THE HIGH-TC SUPERCONDUCTORS BA2YCU3O7 AND BA2EUCU3O7 [J].
BATLOGG, B ;
CAVA, RJ ;
JAYARAMAN, A ;
VANDOVER, RB ;
KOUROUKLIS, GA ;
SUNSHINE, S ;
MURPHY, DW ;
RUPP, LW ;
CHEN, HS ;
WHITE, A ;
SHORT, KT ;
MUJSCE, AM ;
RIETMAN, EA .
PHYSICAL REVIEW LETTERS, 1987, 58 (22) :2333-2336
[6]   POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM [J].
BEDNORZ, JG ;
MULLER, KA .
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1986, 64 (02) :189-193
[7]   Multi-gap superconductivity in MgB2:: Magneto-Raman spectroscopy [J].
Blumberg, G. ;
Mialitsin, A. ;
Dennis, B. S. ;
Zhigadlo, N. D. ;
Karpinski, J. .
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2007, 456 (1-2) :75-82
[8]   ON A NEW METHOD IN THE THEORY OF SUPERCONDUCTIVITY [J].
BOGOLJUBOV, NN .
NUOVO CIMENTO, 1958, 7 (06) :794-805
[9]   Specific heat of Mg11B2:: Evidence for a second energy cap -: art. no. 047001 [J].
Bouquet, F ;
Fisher, RA ;
Phillips, NE ;
Hinks, DG ;
Jorgensen, JD .
PHYSICAL REVIEW LETTERS, 2001, 87 (04) :47001-1
[10]   Experimental confirmation of the low B isotope coefficient of MgB2 [J].
Brotto, P. ;
Tropeano, M. ;
Ferdeghini, C. ;
Manfrinetti, P. ;
Palenzona, A. ;
d'Agliano, E. Galleani ;
Putti, M. .
PHYSICAL REVIEW B, 2008, 78 (09)
123456