Penetration Depth Measurements in MgB_2: Evidence for Unconventional Superconductivity

Details Penetration Depth Measurements in MgB_2: Evidence for Unconventional Superconductivity Penetration Depth Measurements in MgB_2: Evidence for Unconventional Superconductivity

2001-03-02

arxiv.org/abs/cond-mat/0103060v1

Physical Review B vol 64, 094514 (2001)

Physics

Condensed Matter

Superconductivity

4 pages 3 figures

Scientific paper

10.1103/PhysRevB.64.094514

We have measured the magnetic penetration depth of the recently discovered binary superconductor MgB_2 using muon spin rotation and low field $ac$-susceptibility. From the damping of the muon precession signal we find the penetration depth at zero temperature is about 85nm. The low temperature penetration depth shows a quadratic temperature dependence, indicating the presence of nodes in the superconducting energy gap.

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