Spontaneous Antiferromagnetic Ordering in a Single Layer of (BETS)2GaCl4 Organic Superconductor,Advanced Electronic Materials

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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 T_c 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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