Published March 1996 | Version v1
Journal article Metadata-only

Thermal depinning of flux lines in HgBa2 CuO4+δ from 199Hg spin-lattice relaxation

Creators

  • 1. Department of Physics/High Density Electronics Center, University of Arkansas, Fayetteville, Arkansas 72701 (United States)
  • 2. Interuniversitario di Fisica della Meteria-Dipartimento di Fisica ''A. Volta'', Universita di Pavia, I-27100 Pavia (Italy)
  • 3. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)

Description

199Hg NMR spin-lattice relaxation rates in an aligned powder sample of the anisotropic high-Tc superconductor HgBa2CuO4+δ (Tc=96 K) show anisotropy in the temperature interval 10 endash 50 K, with an extra contribution present for the external magnetic field parallel to the c axis. The extra contribution shifts with magnetic field in a way related to the irreversibility temperature Tirr, indicating that the thermal motion of flux lines (FL close-quote s) is the cause of the extra relaxation. A simple model is presented to analyze the relaxation data and to extract values for the correlation time τc and the effective activation energy U of the FL motion. copyright 1996 The American Physical Society

Additional details

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
76
Journal Issue
11
Journal Page Range
p. 1928-1931.
ISSN
0031-9007
CODEN
PRLTAO

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
27074319
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ANISOTROPY; BARIUM OXIDES; COPPER OXIDES; HIGH-TC SUPERCONDUCTORS; MAGNETIC FLUX; MERCURY OXIDES; MIXED STATE; MOTION; NUCLEAR MAGNETIC RESONANCE; RELAXATION; SPIN-LATTICE RELAXATION; TEMPERATURE DEPENDENCE; THERMODYNAMIC PROPERTIES
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; MAGNETIC RESONANCE; MERCURY COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RESONANCE; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS