%0 Journal Article
%T Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2
%A Amos Sharoni
%A Israel Felner
%A Oded Millo
%J Physics
%D 2001
%I arXiv
%R 10.1103/PhysRevB.63.220508
%X 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
%U http://arxiv.org/abs/cond-mat/0102325v4