arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1102.2217cond-mat.supr-con
收藏

弱关联超导体KxFe2-ySe2的热电研究

Thermoelectric studies of KxFe2-ySe2: weakly correlated superconductor

Kefeng Wang, Hechang Lei, C. Petrovic

摘要:

本文报道了KxFe_(2-y)Se_2超导单晶的热输运测量。在TC/2附近观察到热导率的显著峰异常,表明在超导状态下存在大的声子平均自由程。零温外推热电功率小于典型强关联超导体的零温外推热电功率,表明超导体具有较大的归一化费米温度。与其他铁超导体相比,在我们的样品中的热电功率没有表现出显着的异常。这些结果表明,KxFe_(2-y)Se_(2-y)是一个弱或中等关联的超导体,没有明显的费米面嵌套。

英文摘要:

We report thermal transport measurement of KxFe2-ySe2 superconducting single crystal. Significant peak anomaly in thermal conductivity is observed at nearly TC/2 indicating a large phonon mean-free-path in the superconducting state. The zero-temperature extrapolated thermoelectric power is smaller than the value in typical strongly correlated superconductors, implying large normalized Fermi temperature. In contrast to other iron superconductors, thermoelectric power in our sample does not exhibit significant anomalies. These findings indicate that KxFe2-ySe2 is a weakly or intermediately correlated superconductor without significant Fermi surface nesting.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑