Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2

Abstract

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

accepted to PRB, revised version

References in corpus (3)

• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering
• Scanning Tunneling Spectroscopy in MgB2

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