从正常态电阻探讨MgB2的超导机制

Normal-state resistance characteristics vs superconducting mechanism of MgB_2 thin films

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摘要采用化学气相沉积先驱B薄膜两步异位退火法在不同条件下制备了6个MgB2超导薄膜样品,测量了样品的电阻随温度变化关系;结合描述正常态电阻的Bloch-Gruneisen公式,研究了正常态电阻的特性;正常态电阻的测量结果与电子-声子相互作用的描述相符,认为MgB2的超导机制是以声子为媒介的电子-声子相互作用为主。 Six samples of superconducting MgB2 thin films are prepared by a two - step ex - situ magnesium - diffusion method with the precursor boron thin films grown by CVD from B2 H6. Resistance - temperature curves of MgB2 superconducting thin films are measured by the methods of DC resistance. Based on the Bloch - Gruneisen formula, main resistance characteristics of the samples in normal state are investigated. The results suggest that Superconducting mechanism of MgB2 is a phonon - mediated strong electron -phonon interaction.

作者劳振花王殿生

机构地区东营职业学院中国石油大学物理科学与技术学院

出处《低温与超导》 CAS CSCD 北大核心 2008年第5期52-55,59,共5页 Cryogenics and Superconductivity

关键词 MGB2 超导机制正常态电阻电子声子 MgB2, Superconducting mechanism, Normal state resistance, Electron, Phonon

分类号 O511 [理学—低温物理] TM26 [一般工业技术—材料科学与工程]

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从正常态电阻探讨MgB2的超导机制

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