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Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor

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Title
Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor
Author(s)
Seokhwan Choi; Hyoung Joon Choi; Jong Mok Ok; Yeonghoon Lee; Won-Jun Jang; Alex Taekyung Lee; Young Kuk; SungBin Lee; Andreas J. Heinrich; Sang-Wook Cheong; Yunkyu Bang; Steven Johnston; Jun Sung Kim; Jihnhwan Lee
Publication Date
2017-11
Journal
PHYSICAL REVIEW LETTERS, v.119, no.22, pp.227001 -
Publisher
AMER PHYSICAL SOC
Abstract
We have explored a new mechanism for switching magnetism and superconductivity in a magnetically frustrated iron-based superconductor using spin-polarized scanning tunneling microscopy (SPSTM). Our SPSTM study on single crystal Sr 2 VO 3 FeAs shows that a spin-polarized tunneling current can switch the Fe-layer magnetism into a non-trivial C 4 (2× 2) order, not achievable by thermal excitation with unpolarized current. Our tunneling spectroscopy study shows that the induced C 4 (2× 2) order has characteristics of plaquette antiferromagnetic order in Fe layer and strongly suppressed superconductivity. Also, thermal agitation beyond the bulk Fe spin ordering temperature erases the C 4 state. These results suggest a new possibility of switching local superconductivity by changing the symmetry of magnetic order with spin-polarized and unpolarized tunneling currents in iron-based superconductors.
URI
https://pr.ibs.re.kr/handle/8788114/4088
ISSN
0031-9007
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > Journal Papers (저널논문)
Center for Quantum Nanoscience(양자나노과학 연구단) > Journal Papers (저널 논문)
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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