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Spontaneous Antiferromagnetic Ordering in a Single Layer of (BETS)2GaCl4 Organic Superconductor
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-09-13 , DOI: 10.1002/aelm.202000461
Abdou Hassanien 1 , Biao Zhou 2 , Akiko Kobayashi 2
Affiliation  

Scanning tunneling microscopy and spectroscopy are presented to study the interplay between superconductivity and magnetism in a single‐layer organic d‐wave superconductor (BETS)2GaCl4 on Ag(111). Antiferromagnetic molecular chains of GaCl4 are spontaneously formed within (BETS)2GaCl4 superconducting single layer due to shortages of BETS dimers. Below transition temperature of 7 K, the superconducting order masks the antiferromagnetic order and dominates the electronic properties, showing a ubiquitous gap over the entire island with proximity effect across the island/Ag(111) interface. These features gradually decay with the rise in temperature giving way to a Kondo dip on GaCl4 chains, with additional inelastic vibronic features on (BETS)2GaCl4 stripes. The concurrent absence of these signals below Tc may be related to a renormalization process where both phonon and antiferromagnetic fluctuation exhibit a cooperative existence to mediate superconductivity in such d‐wave superconductors.

中文翻译:

(BETS)2GaCl4有机超导体单层中的自发反铁磁有序

提出了扫描隧道显微镜和光谱学,以研究在Ag(111)上的单层有机d波超导体(BETS)2 GaCl 4中超导性和磁性之间的相互作用。由于缺少BETS二聚体,在(BETS)2 GaCl 4超导单层内自发形成了GaCl 4的反铁磁分子链。在7 K的转变温度以下,超导阶掩盖了反铁磁阶并支配了电子特性,显示出整个岛上无处不在的间隙,跨岛/ Ag(111)界面具有邻近效应。随着温度的升高,这些特征逐渐衰减,而在GaCl 4上的近藤浸蚀链,在(BETS)2 GaCl 4条纹上具有附加的非弹性振动特征。在T c以下同时缺少这些信号可能与重归一化过程有关,在该过程中,声子和反铁磁涨落均表现出协作存在,以介导此类d波超导体中的超导性。
更新日期:2020-10-11
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