Viscous flux motion in anisotropic type-II superconductors in low fields

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6226020

Hao, Zhidong; Clem, J R ^[1]

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1. Ames Lab., IA (USA) Iowa State Univ. of Science and Technology, Ames, IA (USA). Dept. of Physics

The Bardeen-Stephen model of viscous flux motion in isotropic Type-II superconductors is extended to the anisotropic case characterized by a phenomenological effective mass tensor m{sub ij}. When the magnetic field is low and the vortex lines are aligned along one of the three principal axes, simple expressions for the viscosity tensor {eta}{sub ij} of the viscous flux motion are obtained as functions of m{sub ij} and the normal state conductivity tensor {sigma}{sub ij} for temperature T close to the critical temperature {Tc}. For the high-temperature oxide superconductors the theory predicts that {eta}{sub b}{sup (a)}:{eta}{sub b}{sup (c)}:{eta}{sub c}{sup (a)} {approx} 1:4{gamma}:3{gamma}{sup 2}, where {eta}{sub i}{sup (j)} is the viscosity for the motion along the i-axis of a vortex parallel to the j-axis and {gamma} = {radical}m{sub c}/m{sub a} is the anisotropy parameter (m{sub i}, i = a,b,c, are the principal values of the mass tensor satisfying m{sub a} {approx} m{sub b} {much lt} m{sub c}). 9 refs., 1 fig.

• Research Organization: Iowa State Univ. of Science and Technology, Ames, IA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6226020
• Report Number(s): IS-M-655; CONF-900944-33; ON: DE91006675; TRN: 91-002005
• Resource Relation: Conference: Applied superconductivity conference, Aspen, CO (USA), 24-28 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
VISCOUS FLOW
TYPE-II SUPERCONDUCTORS
ELECTRIC CONDUCTIVITY
MAGNETIC FIELDS
TRANSITION TEMPERATURE
ELECTRICAL PROPERTIES
FLUID FLOW
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
656100* - Condensed Matter Physics- Superconductivity