Quantum tunneling of vortices in single crystal Tl2CaBa2Cu2O8 superconductors

F. Zuo, A. C. Shi, A. J. Berlinsky, H. M. Duan, A. M. Hermann

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Data are presented on the temperature-dependent time-logarithmic magnetic relaxation rate S(T) = |dM/din t| of the high-Tc superconductor Tl2CaBa2 Cu2O8. It is found that at low temperatures the relaxation rate has the form S(T) = A(H) exp[(T/T*)2], which does not extrapolate to zero at T = 0, thus excluding conventional thermally activated flux creep and providing evidence of quantum vortex tunneling. From a quantum flux tunneling theory, it is shown that S(T) ∝ I/ηerp2. The measurements of the relaxation rate thus provide information about the effective viscosity ηe of fluxons.

Original languageEnglish (US)
Pages (from-to)393-401
Number of pages9
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - Dec 1 1994

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics


Dive into the research topics of 'Quantum tunneling of vortices in single crystal Tl<sub>2</sub>CaBa<sub>2</sub>Cu<sub>2</sub>O<sub>8</sub> superconductors'. Together they form a unique fingerprint.

Cite this