期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
Calculation About the Electrons-phonons Interactional Constant and Superconducting Transition Temperature of MgB_2
摘要/Abstract
计入短波声子的倒逆过程和电子的屏蔽效应,推导出电子-声子相互作用常数N(0)V的表达式,并利用有关的实验数据计算出N(0)V=0.309,Debye温度为798.45 K,纵向Debye温度ΘDL为1 137.3 K.以ΘDL取代BCSTc公式中的ΘD,求得Tc=38.8 K,该值与实验结果符合得很好.研究表明,对MgB2的超导有贡献的主要是纵向声子.
By considering the umklapp processes of shortwave phonons and the screen effects between electrons,an expression of electrons-phonons interactional constant N(0)V is induced,and N(0)V=0.309,the Debye temperature ΘD=798.45 K and which longitudinal value ΘDL=1 137.3 K are calculated,by use of the concerned experimental data.Replacing ΘD in the BCS formula of Tc with the numerical value of ΘDL.It is obtained that the superconducting transition temperature is Tc=38.8 K,which agrees well with experiment.The results show that superconducting is dominated by the longitudinal phonons.