Magnetic relaxation and quantum tunneling of vortices in a polycrystalline Hg0.8Tl0.2Ba2Ca2Cu3O8 superconductor

Xixiang Zhang*, A. García, J. Tejada, Y. Xin, G. F. Sun, K. W. Wong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Magnetic relaxation in a polycrystalline Hg0.8Tl0.2Ba2Ca2Cu3O8 [(Hg,Tl)-1223] superconductor was measured in the temperature range 1.85 20 K with different magnetic fields applied during the cooling process. The relaxation curves show a nearly perfect linear ln(t) behavior. The temperature dependence of the normalized relaxation rate, Rd(M/M0)/dln(t), was studied for two applied magnetic fields. With the lower applied field (Ha=3 kOe), a temperature-independent R is found below 2.1 K and explained in terms of quantum tunneling of vortices. As the applied field increases (Ha=10 kOe), the transition from the thermal to the quantum regime is not found in the experimentally accessible temperature range above 1.85 K. The field dependence of R at 2.8 K is studied in order to analyze the dimensionality of the flux-line lattice.

Original languageEnglish (US)
Pages (from-to)1325-1330
Number of pages6
JournalPhysical Review B
Volume52
Issue number2
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Magnetic relaxation and quantum tunneling of vortices in a polycrystalline Hg0.8Tl0.2Ba2Ca2Cu3O8 superconductor'. Together they form a unique fingerprint.

Cite this