Quantum tunneling of vortices in a MgB$_2$ superconductor

Details Quantum tunneling of vortices in a MgB$_2$ superconductor Quantum tunneling of vortices in a MgB$_2$ superconductor

2002-04-18

arxiv.org/abs/cond-mat/0204396v3

Appl. Phys. Lett. 81, 4802 (2002)

Physics

Condensed Matter

Superconductivity

RevTex4, 8pages, 3 figures

Scientific paper

10.1063/1.1530735

Magnetic relaxation in a MgB$_2$ superconductor was measured. The temperature dependence of the normalized relaxation rate was determined for three different magnetic fields. By extrapolating these rates to T=0 K, we find that these extrapolations do not approach zero, indicating quantum tunneling of vortices in the superconductor. A quantum correction of the relaxation rate, followed by the correction of the magnetic moment, is proposed. Using the quantum correction, we find that $U_0$ increases with decreasing temperature and approaches a maximum at T=0.

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