Signature of Superconductivity in Orthorhombic CoSb Monolayer Films on SrTiO3(001)

Cui Ding; Guanming Gong; Yanzhao Liu; Fawei Zheng; Zhiyu Zhang; Haohao Yang; Zhe Li; Ying Xing; Jun Ge; Ke He; Wei Li; Ping Zhang; Jian Wang; Lili Wang; Qi-Kun Xue

doi:10.1021/acsnano.9b04223

Signature of Superconductivity in Orthorhombic CoSb Monolayer Films on SrTiO₃(001)

ACS Nano. 2019 Sep 24;13(9):10434-10439. doi: 10.1021/acsnano.9b04223. Epub 2019 Aug 29.

Authors

Cui Ding¹, Guanming Gong¹, Yanzhao Liu², Fawei Zheng³, Zhiyu Zhang¹, Haohao Yang¹, Zhe Li¹, Ying Xing^{2

4}, Jun Ge², Ke He^{1

5

6}, Wei Li^{1

5}, Ping Zhang³, Jian Wang^{2

5

7

6}, Lili Wang^{1

5}, Qi-Kun Xue^{1

5

6}

Affiliations

¹ State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics , Tsinghua University , Beijing 100084 , China.
² International Center for Quantum Materials, School of Physics , Peking University , Beijing 100871 , China.
³ Institute of Applied Physics and Computational Mathematics , Beijing 100088 , China.
⁴ Department of Materials Science and Engineering, School of New Energy and Materials , China University of Petroleum , Beijing 102249 , China.
⁵ Collaborative Innovation Center of Quantum Matter , Beijing 100084 , China.
⁶ Beijing Academy of Quantum Information Sciences , Beijing 100193 , China.
⁷ CAS Center for Excellence in Topological Quantum Computation , University of Chinese Academy of Sciences , Beijing 100190 , China.

PMID: 31460747
DOI: 10.1021/acsnano.9b04223

Abstract

We prepare orthorhombic CoSb monolayer films on SrTiO₃(001) substrate by molecular beam epitaxy and observe symmetric gap around the Fermi level with coherence peaks at ± (6-7) meV by in situ scanning tunneling spectroscopy. Ex situ magnetization measurements of the films protected by Te and Si films consistently reveal a diamagnetic transition at 14 K. These results suggest the occurrence of superconductivity in orthorhombic CoSb monolayers on SrTiO₃(001).

Keywords: CoSb/SrTiO3; interface superconductor; magnetization measurement; molecular beam epitaxy; scanning tunneling microscopy/spectroscopy.