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首页> 外文期刊>Advanced Science Letters >Study of Lattice Strain Effect in Oxypnictide Superconductors Using Two-Band Model
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Study of Lattice Strain Effect in Oxypnictide Superconductors Using Two-Band Model

机译:两带模型研究氧掺杂超导体的晶格应变效应

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摘要

We consider a model Hamiltonian describing the Jahn-Teller (JT) distorted iron-based superconductor in normal phase. The model consists of a two-band model associated with the hybridization between d_(xz) and d_(yz) bands. Then we have introduced an isotropic lattice strain for both the bands, there by producing a JT gap of magnitude 2Ge with G as the JT coupling and e as lattice strain. The temperature dependent lattice strain is calculated by Green's function technique and solved self-consistently. The effect of lattice strain on the electron occupation numbers of both the bands and tunneling conductance is investigated. The results are discussed to explain the experimental measurements for the Oxypnictide iron-based systems.
机译:我们考虑一个模型哈密顿量,该模型描述了正相中的Jahn-Teller(JT)变形铁基超导体。该模型由与d_(xz)和d_(yz)频段之间的混合关联的两频段模型组成。然后,我们引入了两个带的各向同性晶格应变,在那里产生了一个幅度为2Ge的JT间隙,其中G为JT耦合,e为晶格应变。温度相关的晶格应变通过格林函数技术计算并自洽求解。研究了晶格应变对带的电子占据数和隧穿电导的影响。对结果进行了讨论,以解释基于氧氧化铁的系统的实验测量。

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