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

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, Jhinhwan Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

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.

Original languageEnglish
Article number227001
JournalPhysical Review Letters
Volume119
Issue number22
DOIs
Publication statusPublished - 2017 Nov 27

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superconductivity
iron
scanning tunneling microscopy
spin temperature
thermal energy
single crystals
symmetry
spectroscopy
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Choi, Seokhwan ; Choi, Hyoung Joon ; Ok, Jong Mok ; Lee, Yeonghoon ; Jang, Won Jun ; Lee, Alex Taekyung ; Kuk, Young ; Lee, Sungbin ; Heinrich, Andreas J. ; Cheong, Sang Wook ; Bang, Yunkyu ; Johnston, Steven ; Kim, Jun Sung ; Lee, Jhinhwan. / Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor. In: Physical Review Letters. 2017 ; Vol. 119, No. 22.
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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.",
author = "Seokhwan Choi and Choi, {Hyoung Joon} and Ok, {Jong Mok} and Yeonghoon Lee and Jang, {Won Jun} and Lee, {Alex Taekyung} and Young Kuk and Sungbin Lee and Heinrich, {Andreas J.} and Cheong, {Sang Wook} and Yunkyu Bang and Steven Johnston and Kim, {Jun Sung} and Jhinhwan Lee",
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Choi, S, Choi, HJ, Ok, JM, Lee, Y, Jang, WJ, Lee, AT, Kuk, Y, Lee, S, Heinrich, AJ, Cheong, SW, Bang, Y, Johnston, S, Kim, JS & Lee, J 2017, 'Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor', Physical Review Letters, vol. 119, no. 22, 227001. https://doi.org/10.1103/PhysRevLett.119.227001

Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor. / Choi, Seokhwan; Choi, Hyoung Joon; Ok, Jong Mok; Lee, Yeonghoon; Jang, Won Jun; Lee, Alex Taekyung; Kuk, Young; Lee, Sungbin; Heinrich, Andreas J.; Cheong, Sang Wook; Bang, Yunkyu; Johnston, Steven; Kim, Jun Sung; Lee, Jhinhwan.

In: Physical Review Letters, Vol. 119, No. 22, 227001, 27.11.2017.

Research output: Contribution to journalArticle

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AU - Choi, Seokhwan

AU - Choi, Hyoung Joon

AU - Ok, Jong Mok

AU - Lee, Yeonghoon

AU - Jang, Won Jun

AU - Lee, Alex Taekyung

AU - Kuk, Young

AU - Lee, Sungbin

AU - Heinrich, Andreas J.

AU - Cheong, Sang Wook

AU - Bang, Yunkyu

AU - Johnston, Steven

AU - Kim, Jun Sung

AU - Lee, Jhinhwan

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