Correlation between superconducting transition temperatures and carrier densities in Te- and S-substituted FeSe thin films
Correlation between superconducting transition temperatures and carrier densities in Te- and S-substituted FeSe thin films
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DOI：
10.1103/physrevb.101.184517
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发表时间：
2020-05
影响因子：
3.7
通讯作者：
F. Nabeshima;T. Ishikawa;N. Shikama;A. Maeda
中科院分区：
文献类型：
--
作者：
F. Nabeshima;T. Ishikawa;N. Shikama;A. Maeda
我们比较研究了S和Te替代的FeSe薄膜在磁场下的输运性质，以阐明S和Te替代的超导转变温度差异的原因。经典的双载流子分析表明，薄膜的载流子密度随着Te含量的增加而增加，而S取代的薄膜的载流子密度没有明显变化，这表明薄膜的载流子密度与载流子密度之间存在一定的相关性。这些观察结果表明，结构转变对Fe(Se，S)和Fe(Se，Te)电子结构的影响是不同的，这一事实是结构转变终点的${T}{\mathm{c}}行为不同的直接原因。
We comparatively investigated the transport properties for S- and Te-substituted FeSe thin films under magnetic fields to clarify the origin of the contrasting behavior of the superconducting transition temperature in S and Te substitution. A classical two-carrier analysis revealed that the carrier densities of the films increased with increasing Te content, while no significant change was observed for the S substitution, which suggests a correlation between ${T}_{\mathrm{c}}$ and the carrier densities. These observations suggest that the structural transition affects the electronic structure in a different manner between Fe(Se,S) and Fe(Se,Te) and that this fact is the direct cause of the difference in the ${T}_{\mathrm{c}}$ behaviors at the end point of the structural transition.