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

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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 Sr2VO3 FeAs shows that a spin-polarized tunneling current can switch the Fe-layer magnetism into a nontrivial C-4 (2 x 2) order, which cannot be achieved by thermal excitation with an unpolarized current. Our tunneling spectroscopy study shows that the induced C-4 (2 x 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 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.
Publisher
AMER PHYSICAL SOC
Issue Date
2017-11
Language
English
Article Type
Article
Keywords

CHALCOGENIDES; TRANSITION; ORDER

Citation

PHYSICAL REVIEW LETTERS, v.119, no.22, pp.227001

ISSN
0031-9007
DOI
10.1103/PhysRevLett.119.227001
URI
http://hdl.handle.net/10203/228614
Appears in Collection
PH-Journal Papers(저널논문)
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