Field dependence of π-band superconducting gap in MgB2 thin films from point-contact spectroscopy

Yan Huang, Yong Lei Wang, Lei Shan, Ying Jia, Huan Yang, Hai Hu Wen, Cheng Gang Zhuang, Qi Li, Yi Cui, Xiao Xing Xi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We present the results of point-contact spectroscopy measurements on high-quality epitaxial MgB2 thin films with injected current along the c-axis. The temperature and field dependences of π-band properties with the field parallel to (H||) or perpendicular to (H) the c-axis are investigated in detail. When a magnetic field is applied, either parallel or perpendicular to the c-axis, the density of the quasiparticle state (DOS) of the π-band proliferates quickly with increasing field, while the gap amplitude of the π-band decreases slowly, which is different from the recent theoretical calculations, showing a field dependent competition between the interband scattering and the pair-breaking effects.

Original languageEnglish (US)
Pages (from-to)2228-2231
Number of pages4
JournalChinese Physics Letters
Issue number6
StatePublished - Jun 1 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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