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arXiv 1609.08856cond-mat.mtrl-sci
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ThCr2Si2-type Ru基超导体LaRu2M2(M = P和As):从头算研究

ThCr2Si2-type Ru-based superconductors LaRu2M2 (M = P and As): An ab-initio investigation

Md. Zahidur Rahaman, Md. Atikur Rahman

摘要:

最近报道了Tc分别为4K和7.8K的ThCr_2Si_2型Ru基超导体LaRu_2P_2和LaRu_2As_2。利用第一性原理方法,我们研究了这些新发现的超导体的详细的物理和超导性质,包括结构性质、电子性质、弹性性质和热力学性质。我们研究的晶格参数与实验结果符合得很好。电子能带结构和态密度(DOS)的分析表明,这两种化合物的金属性质来自La和Ru,化学键的研究表明,这两种化合物中存在共价键、离子键和金属键的混合物。力学性能的研究表明,LaRu_2P_2为脆性,LaRu_2As_2为韧性,两种化合物均表现出各向异性。最后,我们确定了德拜温度和详细的超导参数,表明所研究的两种化合物是声子介导的介质耦合BCS超导体。

英文摘要:

ThCr2Si2-type Ru-based superconductors LaRu2P2 and LaRu2As2 with Tc ~ 4 K and 7.8 K respectively have been reported very recently. Using the first principles method we investigate the details physical and superconducting properties including the structural properties, electronic properties, elastic properties and Thermodynamic properties of these newly discovered superconductors. Our investigated lattice parameters accord well with the experimental result. The analysis of the electronic band structure and density of states (DOS) indicates the metallic nature of both the compounds emerges from the La and Ru and the study of chemical bonding implies that a mixture of covalent, ionic and metallic bonds exist in both the compounds. The study of the mechanical properties revels that LaRu2P2 is brittle in nature while LaRu2As2 demonstrates the ductile nature and both the compounds show anisotropic characteristics. Finally we determine the Debye temperature and details superconducting parameters indicating that both the compounds under study are phonon-mediated medium coupled BCS superconductors.

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