Strong quantum fluctuation of vortices in the new superconductor $MgB_2$

Details Strong quantum fluctuation of vortices in the new superconductor $MgB_2$ Strong quantum fluctuation of vortices in the new superconductor $MgB_2$

2001-02-23

arxiv.org/abs/cond-mat/0102436v3

Chin. Phys. Lett. 18, 816(2001)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1088/0256-307X/18/6/335

By using transport and magnetic measurement, the upper critical field $H_{c2}(T)$ and the irreversibility line $H_{irr}(T)$ has been determined. A big separation between $H_{c2}(0)$ and $H_{irr}(0)$ has been found showing the existence of a quantum vortex liquid state induced by quantum fluctuation of vortices in the new superconductor $MgB_2$. Further investigation on the magnetic relaxation shows that both the quantum tunneling and the thermally activated flux creep weakly depends on temperature. But when the melting field $H_{irr}$ is approached, a drastic rising of the relaxation rate is observed. This may imply that the melting of the vortex matter at a finite temperature is also induced by the quantum fluctuation of vortices.

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