Quantum tunneling of vortices in single crystal Tl2CaBa2Cu2O8 superconductors

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

doi:10.1007/BF00754300

Quantum tunneling of vortices in single crystal Tl₂CaBa₂Cu₂O₈ superconductors

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

Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Data are presented on the temperature-dependent time-logarithmic magnetic relaxation rate S(T) = |dM/d_in t| of the high-T_c 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/η_er_p². The measurements of the relaxation rate thus provide information about the effective viscosity η_e of fluxons.

Original language	English (US)
Pages (from-to)	393-401
Number of pages	9
Journal	Journal of Low Temperature Physics
Volume	97
Issue number	5-6
DOIs	https://doi.org/10.1007/BF00754300
State	Published - Dec 1 1994

ASJC Scopus subject areas

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

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title = "Quantum tunneling of vortices in single crystal Tl2CaBa2Cu2O8 superconductors",

abstract = "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.",

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T1 - Quantum tunneling of vortices in single crystal Tl2CaBa2Cu2O8 superconductors

AU - Zuo, F.

AU - Shi, A. C.

AU - Berlinsky, A. J.

AU - Duan, H. M.

AU - Hermann, A. M.

PY - 1994/12/1

Y1 - 1994/12/1

N2 - 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.

AB - 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.

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Quantum tunneling of vortices in single crystal Tl₂CaBa₂Cu₂O₈ superconductors

Abstract

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