Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2

Details Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2 Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2

2001-02-19

arxiv.org/abs/cond-mat/0102325v4

PRB 63, 220508R (2001)

Physics

Condensed Matter

Superconductivity

accepted to PRB, revised version

Scientific paper

10.1103/PhysRevB.63.220508

Cryogenic scanning tunneling microscopy and magnetization measurements were used to study the superconducting properties of MgB_2. The magnetization measurements show a sharp superconductor transition onset at T_c = 38.5 K, in agreement with previous works. The tunneling spectra exhibit BCS gap structures, with gap parameters in the range of 5 to 7 meV, yielding a ratio of 2delat/KT_c ~ 3-4. This suggests that MgB_2 is a conventional BCS (s-wave) superconductor, either in the weak-coupling or in the `intermediate-coupling` regime

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