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物理学报. 2007, 56(12): 7262-7265.
doi: 10.7498/aps.56.7262.
第一性原理计算MgB2薄膜拉伸对超导电性的影响
- 收稿日期: 2007-04-02
- 修回日期: 2007-06-29
- 刊出日期: 2007-12-20
English Abstract
First principles calculations of the effect of tension of MgB2 film on its superconductivity
- Received Date:
02 April 2007
- Accepted Date:
29 June 2007
- Published Online:
20 December 2007
Abstract: Using the full-potential linear-muffin-tin-orbital programs and the linear-response linear-muffin-tin-orbital programs，we calculated the electronic band structure, phonon spectrum and electron-phonon coupling strength in MgB2 film, and studied the effect of tension of MgB2 film on its superconductivity. It is shown that the softening of E2g phonon frequency, enchancement of the electron-phonon coupling and the phonon logarithm average frequency with contraction of the lattice constant along c-axis and elongation along a-axis resulted in the increase of superconducting transition temperature Tc. Our results are in good agreement with corresponding experiment.
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