Spintronic superconductor in a bulk layered material with natural spin-valve structure-猫眼课题宝

DOI：

发表时间：

2020-01

期刊：

arXiv: Superconductivity

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通讯作者：

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其他

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作者：

S. Sakuragi;S. Sasaki;R. Akashi;R. Sakagami;K. Kuroda;C. Bareille;T. Hashimoto;T. Nagashima;Y. Kinoshita;Y. Hirata;M. Shimozawa;S. Asai;T. Yajima;S. Doi;N. Tsujimoto;S. Kunisada;R. Noguchi;K. Kurokawa;N. Azuma;K. Hirata;Y. Yamasaki;H. Nakao;T. Kim;C. Cacho;T. Masuda;M. Tokunaga;H. Wadati;K. Okazaki;S. Shin;Y. Kamihara;M. Yamashita;T. Kondo

多层材料为实现各种功能特性提供了令人着迷的平台，可能导致未来由外场控制的电子器件。特别是与导电层耦合的层状磁体，最近被广泛研究可能通过自旋结构控制其输运性质。在Dirac费米子和拓扑/轴子材料中，成功地控制了具有反铁磁（AFM）层的材料的量子输运性质，即所谓的自然自旋阀结构。然而，磁性和超导层交替堆叠的块体晶体迄今尚未实现，对其功能特性的研究是材料科学中一个有趣但尚未开发的领域。在这里，我们发现超导性在eun2as2中提供了这样一个理想的平台，磁性Eu层和超导Sn-As层的范德华叠加，并首次证明了超导电流的自然自旋阀效应。在超导转变温度（Tc）以下，电阻率在平面方向上变为零。相反，令人惊讶的是，它在面外方向的最低温度下仍然是有限的，这主要是由于eun2as2中的本禀磁约瑟夫森结的结构。观察到Eu层（或自然自旋阀）的磁序非常柔软，允许人们在弱外部磁场下轻松控制面外与面内电阻率比从1到无穷大。叠层磁超导多功能材料的概念将为开发具有磁可控超导性的新型自旋电子器件开辟新的途径。

Multi-layered materials provide fascinating platforms to realize various functional properties, possibly leading to future electronic devices controlled by external fields. In particular, layered magnets coupled with conducting layers have been extensively studied recently for possible control of their transport properties via the spin structure. Successful control of quantum-transport properties in the materials with antiferromagnetic (AFM) layers, so-called natural spin-valve structure, has been reported for the Dirac Fermion and topological/axion materials. However, a bulk crystal in which magnetic and superconducting layers are alternately stacked has not been realized until now, and the search for functional properties in it is an interesting yet unexplored field in material science. Here, we discover superconductivity providing such an ideal platform in EuSn2As2 with the van der Waals stacking of magnetic Eu layers and superconducting Sn-As layers, and present the first demonstration of a natural spin-valve effect on the superconducting current. Below the superconducting transition temperature (Tc), the electrical resistivity becomes zero in the in-plane direction. In contrast, it, surprisingly, remains finite down to the lowest temperature in the out-of-plane direction, mostly due to the structure of intrinsic magnetic Josephson junctions in EuSn2As2. The magnetic order of the Eu layers (or natural spin-valve) is observed to be extremely soft, allowing one to easy control of the out-of-plane to in-plane resistivities ratio from 1 to infinity by weak external magnetic fields. The concept of multi-functional materials with stacked magnetic-superconducting layers will open a new pathway to develop novel spintronic devices with magnetically controllable superconductivity.

Spintronic superconductor in a bulk layered material with natural spin-valve structure

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