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Title: Unusual temperature dependence of the upper critical field in superconducting heavy-fermion systems

Abstract

A new formulation of the superconducting properties of heavy-fermion metals with potentially dramatic consequences for the critical field is proposed and analyzed. The new feature of the formulation consists of including the field dependence of the normal-state properties such as the magnetic susceptibility, electronic specific heat, and electronic scattering lifetime in the calculation of the superconducting critical field. These effects are important for heavy-fermion metals because (1) the characteristic energy of the low-temperature coherent state is low, so that an applied magnetic field can appreciably alter the normal-state properties, and (2) the large effective masses lead to low Fermi velocities and high orbital critical fields, so that a significant field dependence of the normal-state properties may occur below H/sub c//sub 2/. A Green's-function description of the field dependence of the normal-state properties showing how they arise from field dependence of the self-energy and vertex functions in the periodic Anderson model is given. The effect of these field-dependent normal-state properties on the superconducting critical field is calculated using a generalization of standard theory. For certain values of the parameters, the calculations predict unusually steep critical-field curves and magnetic-field-induced superconductivity, qualitatively similar to recent experimental results.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Materials Science and Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
OSTI Identifier:
6937258
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B: Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 34:11
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; SUPERCONDUCTORS; CRITICAL FIELD; CALCULATION METHODS; CERIUM ALLOYS; EFFECTIVE MASS; ELECTRONIC SPECIFIC HEAT; MAGNETIC SUSCEPTIBILITY; METALS; SELF-ENERGY; TEMPERATURE DEPENDENCE; URANIUM ALLOYS; ACTINIDE ALLOYS; ALLOYS; ELEMENTS; ENERGY; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MASS; PHYSICAL PROPERTIES; RARE EARTH ALLOYS; SPECIFIC HEAT; THERMODYNAMIC PROPERTIES; 656100* - Condensed Matter Physics- Superconductivity

Citation Formats

Tachiki, M, Dunlap, B D, Crabtree, G W, Takahashi, S, and Koyama, T. Unusual temperature dependence of the upper critical field in superconducting heavy-fermion systems. United States: N. p., 1986. Web. doi:10.1103/PhysRevB.34.7603.
Tachiki, M, Dunlap, B D, Crabtree, G W, Takahashi, S, & Koyama, T. Unusual temperature dependence of the upper critical field in superconducting heavy-fermion systems. United States. doi:10.1103/PhysRevB.34.7603.
Tachiki, M, Dunlap, B D, Crabtree, G W, Takahashi, S, and Koyama, T. Mon . "Unusual temperature dependence of the upper critical field in superconducting heavy-fermion systems". United States. doi:10.1103/PhysRevB.34.7603.
@article{osti_6937258,
title = {Unusual temperature dependence of the upper critical field in superconducting heavy-fermion systems},
author = {Tachiki, M and Dunlap, B D and Crabtree, G W and Takahashi, S and Koyama, T},
abstractNote = {A new formulation of the superconducting properties of heavy-fermion metals with potentially dramatic consequences for the critical field is proposed and analyzed. The new feature of the formulation consists of including the field dependence of the normal-state properties such as the magnetic susceptibility, electronic specific heat, and electronic scattering lifetime in the calculation of the superconducting critical field. These effects are important for heavy-fermion metals because (1) the characteristic energy of the low-temperature coherent state is low, so that an applied magnetic field can appreciably alter the normal-state properties, and (2) the large effective masses lead to low Fermi velocities and high orbital critical fields, so that a significant field dependence of the normal-state properties may occur below H/sub c//sub 2/. A Green's-function description of the field dependence of the normal-state properties showing how they arise from field dependence of the self-energy and vertex functions in the periodic Anderson model is given. The effect of these field-dependent normal-state properties on the superconducting critical field is calculated using a generalization of standard theory. For certain values of the parameters, the calculations predict unusually steep critical-field curves and magnetic-field-induced superconductivity, qualitatively similar to recent experimental results.},
doi = {10.1103/PhysRevB.34.7603},
journal = {Phys. Rev. B: Condens. Matter; (United States)},
number = ,
volume = 34:11,
place = {United States},
year = {1986},
month = {12}
}