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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, SeokhwanChoi, Hyoung JoonOk, Jong MokLee, YeonghoonLee, Alex TaekyungKuk, YoungLee, SungBinHeinrich, Andreas J.Cheong, Sang-WookBang, YunkyuJohnston, StevenKim, Jun SungLee, JhinhwanJang, Won-Jun
Ewha Authors
Andreas Heinrich
Issue Date
2017
Journal Title
PHYSICAL REVIEW LETTERS
ISSN
0031-9007JCR Link1079-7114JCR Link
Citation
vol. 119, no. 22
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
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 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.
DOI
10.1103/PhysRevLett.119.227001
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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