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

Title
Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor
Authors
Choi S.Choi H.J.Ok J.M.Lee Y.Jang W.-J.Lee A.T.Kuk Y.Lee S.Heinrich A.J.Cheong S.-W.Bang Y.Johnston S.Kim J.S.Lee J.
Ewha Authors
Andreas Heinrich
Issue Date
2017
Journal Title
Physical Review Letters
ISSN
0031-9007JCR Link
Citation
Physical Review Letters vol. 119, no. 22
Publisher
American Physical Society
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
We explore 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 Sr2VO3FeAs shows that a spin-polarized tunneling current can switch the Fe-layer magnetism into a nontrivial C4 (2×2) order, which cannot be achieved by thermal excitation with an unpolarized current. Our tunneling spectroscopy study shows that the induced C4 (2×2) order has characteristics of plaquette antiferromagnetic order in the Fe layer and strongly suppresses superconductivity. Also, thermal agitation beyond the bulk Fe spin ordering temperature erases the C4 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. © 2017 American Physical Society.
DOI
10.1103/PhysRevLett.119.227001
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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