arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1905.11554cond-mat.supr-concond-mat.str-el
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Eu(Fe $_{1-x}$ Rh $_x$)$_2$ As $_2$的电子结构和$H$-PDMATHAAB phase diagram

Electronic structure and $H$-$T$ phase diagram of Eu(Fe$_{1-x}$Rh$_x$)$_2$As$_2$

Shaozhu Xiao, Darren C. Peets, Wei Liu, Shiju Zhang, Ya Feng, Wen-He Jiao, Guang-Han Cao, Eike F. Schwier, Kenya Shimada, Cong Li, Xingjiang Zhou, Shaolong He

摘要:

铁基超导体代表了高温超导性的一个有前途的平台,但支撑它们配对的相互作用存在一个难题。EuFe $_2$ As $_2$族在这些材料中是独特的,因为其具有在超导态内开始的磁序,刚好在超导转变之下。超导性和磁序通常是对立的,并且经常争夺相同的未成对电子,但在这个家族中,磁性主要来自局部的Eu矩,它们共存,这些均匀匹配的对手之间的竞争导致可重入超导行为。为了帮助阐明在这个家庭的物理和磁序和超导电性之间的相互作用,我们调查的$H$ - $T$相图附近的最佳Rh掺杂通过比热,电阻率和磁化强度的测量,并研究电子结构的角度分辨光电子能谱。Eu和FeAs层之间的竞争可以提供一种经由ARPES在有效磁场下直接访问电子结构的途径,ARPES通常是严格的零场技术。

英文摘要:

The iron-based superconductors represent a promising platform for high-temperature superconductivity, but the interactions underpinning their pairing present a puzzle. The EuFe$_2$As$_2$ family is unique among these materials for having magnetic order which onsets within the superconducting state, just below the superconducting transition. Superconductivity and magnetic order are normally antagonistic and often vie for the same unpaired electrons, but in this family the magnetism arises from largely localized Eu moments and they coexist, with the competition between these evenly-matched opponents leading to reentrant superconducting behavior. To help elucidate the physics in this family and the interactions between the magnetic order and superconductivity, we investigate the $H$--$T$ phase diagram near optimal Rh doping through specific heat, resistivity, and magnetization measurements, and study the electronic structure by angular-resolved photoemission spectroscopy. The competition between the Eu and FeAs layers may offer a route to directly accessing the electronic structure under effective magnetic fields via ARPES, which is ordinarily a strictly zero-field technique.

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。

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