Nonlocal electrodynamics and low-temperature magnetization of clean high-{kappa} superconductors

Journal Article · Fri Nov 01 00:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.12386· OSTI ID:388335

Kogan, V G ^[1]; Gurevich, A ^[2]; Cho, J H ^[3]; Johnston, D C; Xu, M ^[1]; Thompson, J R ^[4]; Martynovich, A ^[5]

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1. Ames Laboratory and Physics Department, Iowa State University, Ames, Iowa 50011 (United States)
2. Applied Superconductivity Center, University of Wisconsin, Madison, Wisconsin 53706-1687 (United States)
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
4. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6061 (United States)
5. Phystech, 340114 Donetsk (Ukraine)

We show that magnetic properties of clean superconductors with a large Ginzburg-Landau parameter {kappa} at low temperatures are affected by the nonlocality of the microscopic current-field relation and can be described by modified London equations. We argue that for clean materials at low temperatures, the standard London formula for the reversible magnetization in intermediate fields, {ital M}{approximately}ln({ital H}{sub {ital c}2}/{ital B}), should contain the field {ital H}{sub 0}{approximately}{phi}{sub 0}/{rho}{sup 2} instead of {ital H}{sub {ital c}2}{approximately}{phi}{sub 0}/{xi}{sup 2}({ital T}), with {rho} being the nonlocality range on the order of {xi}{sub 0}, the zero-{ital T} coherence length. Since {rho} depends weakly on {ital T}, the magnetization should exhibit an approximate scaling {ital M}({ital T},{ital B})={ital X}({ital T}){ital Y}({ital B}) as observed in Bi- and Tl-based compounds in a broad temperature domain well below {ital T}{sub {ital c}}. Our expression for the magnetization reduces to the standard London result near {ital T}{sub {ital c}} and at any temperature for the dirty case. Implications of our results for interpretation of neutron scattering data and for procedures of extracting the penetration depth are discussed. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-96OR22464; W-7405-ENG-82
• OSTI ID: 388335
• Journal Information: Physical Review, B: Condensed Matter, Vol. 54, Issue 17; Other Information: PBD: Nov 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
SUPERCONDUCTORS
MAGNETIZATION
ELECTRODYNAMICS
GINZBURG-LANDAU THEORY
COHERENCE LENGTH
LONDON EQUATION
PENETRATION DEPTH
NEUTRON DIFFRACTION
SCALING