Thermal depinning of flux lines in HgBa2CuO4 + δ from 199Hg spin-lattice relaxation

B. J. Suh, F. Borsa, J. Sok, D. R. Torgeson, M. Corti, A. Rigamonti, Q. Xiong

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27 Scopus citations

Abstract

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 10-50 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’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.

Original languageEnglish
Pages (from-to)1928-1931
Number of pages4
JournalPhysical Review Letters
Volume76
Issue number11
DOIs
StatePublished - 11 Mar 1996

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