Superconductivity in beta-Tin Germanium

作者：Zhang Chao; Chen Xiao Jia; Lin Hai Qing^*

来源：Journal of Superconductivity and Novel Magnetism, 2013, 26(5): 2009-2011.

DOI：10.1007/s10948-012-1921-6

• Germanium
• Electron-phonon coupling
• Pressure effect
• First-principles calculations

The superconducting properties of the beta-tin germanium under pressure have been investigated by the first-principles calculations based on density functional perturbation theory. The electron-phonon coupling strength as a function of pressure was calculated, and it deceases with the application of pressure. Using the calculated electron-phonon coupling strength, the superconducting transition temperature T-c has been estimated. Assuming a nominal Coulomb repulsion parameter of 0.1, the calculated T-c is in excellent agreement with experimental data. The T-c correlates with electron-phonon coupling strength, indicating phonon-mediated superconductivity in beta-tin Ge phase. Our findings have great implications to other Group IVa elements.

• 出版日期2013-5
• 单位华南理工大学; 北京计算科学研究中心