铁砷超导体比热特征的理论和实验比较研究  

COMPARAISONAL RESEARCH BETWEEN THEORETIC SPECIFIC HEAT AND EXPERIMENTAL RESULTS IN FeAs SUPERCONDUCTORS

作　　者：王晓霞[1] 李岩静[1] 单倩倩[1] 李军[1] 李平林[1] 

机构地区：[1]郑州大学物理工程学院

出　　处：《低温物理学报》2012年第4期246-252,共7页Low Temperature Physical Letters

基　　金：国家自然科学基金(批准号:10647145);大学生创新实验计划(批准号:2010CXSY103)资助的课题~~

摘　　要：以海森堡相互作用模型为基础,系统分析了铁砷超导体自旋密度波的反铁磁表现形态,计算了长波近似条件下的内能和比热等理论值,比较讨论了与实验结果的符合情况及其相应意义,表明自旋密度波理论在较低温度下基本能够描述铁砷超导体的有关特征.详细分析讨论了电子和声子在不同低温区对比热的贡献,与实验结果进行了比较.Based on the magnetic order of FeAs superconductors from the experiments, we apply Heisenberg interaction model and analyze systematically the antiferromagnetic configuration with the spin-density-wave, through the strictly mathematical-physical derivation, to suggest the analytic expressions of internal energy and specific heat under the long-wave conditions. The theoretic values show good consistence with the experiments, and both theoret- ic and experimental results are discussed sufficiently through the phonon contribution to the specific heat in general, therefore, the spin density wave theory can properly describe the physical characteristics of FeAs superconductors. Especially, we analyse and discusse in detail that electrons and phonons respectively play the function for the specific heat in the different scopes of low temperature, the relevant experiments show the similar characteristcs.

关 键 词：铁砷超导体 海森堡模型 自旋密度波 内能和比热 电子和声子 

分 类 号：O511.4[理学—低温物理]