TY - JOUR
T1 - Two-dimensional superconductivity and anisotropic transport at KTaO3 (111) interfaces
AU - Liu, Changjiang
AU - Yan, Xi
AU - Jin, Dafei
AU - Ma, Yang
AU - Hsiao, Haw-Wen
AU - Lin, Yulin
AU - Bretz-Sullivan, Terence M
AU - Zhou, Xianjing
AU - Pearson, John
AU - Fisher, Brandon
AU - Jiang, J Samuel
AU - Han, Wei
AU - Zuo, Jian-Min
AU - Wen, Jianguo
AU - Fong, Dillon D
AU - Sun, Jirong
AU - Zhou, Hua
AU - Bhattacharya, Anand
N1 - Funding Information:
We thank I. Martin, M. Norman, and P. Littlewood for discussions. We thank C. Sun for the reference XANES spectral of Ta metal foil and M. Eblen-Zayas for discussions about EuO growth. All work at Argonne was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The use of facilities at the Center for Nanoscale Materials and the Advanced Photon Source, both Office of Science user facilities, was supported by the U.S. Department of Energy, Basic Energy Sciences, under Contract no. DE-AC02-06CH11357. The support provided by China Scholarship Council (CSC) during a visit of X.Y. to Argonne National Laboratory is acknowledged. J.S. acknowledges the support of the National Natural Science Foundation of China (no. 11934016). J.-M.Z. is supported by the Energy & Biosciences Institute through the EBI-Shell program. The work at Peking University was supported by National Natural Science Foundation of China (grant no. 11974025).
Publisher Copyright:
Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works
PY - 2021/2/12
Y1 - 2021/2/12
N2 - The distinctive electronic structure found at interfaces between materials can allow unconventional quantum states to emerge. Here we report on the discovery of superconductivity in electron gases formed at interfaces between (111)-oriented KTaO3 and insulating overlayers of either EuO or LaAlO3 The superconducting transition temperature, as high as 2.2 kelvin, is about one order of magnitude higher than that of the LaAlO3/SrTiO3 system. Notably, similar electron gases at KTaO3 (001) interfaces remain normal down to 25 millikelvin. The critical field and current-voltage measurements indicate that the superconductivity is two-dimensional. In EuO/KTaO3 (111) samples, a spontaneous in-plane transport anisotropy is observed before the onset of superconductivity, suggesting the emergence of a distinct "stripe"-like phase, which is also revealed near the critical field.
AB - The distinctive electronic structure found at interfaces between materials can allow unconventional quantum states to emerge. Here we report on the discovery of superconductivity in electron gases formed at interfaces between (111)-oriented KTaO3 and insulating overlayers of either EuO or LaAlO3 The superconducting transition temperature, as high as 2.2 kelvin, is about one order of magnitude higher than that of the LaAlO3/SrTiO3 system. Notably, similar electron gases at KTaO3 (001) interfaces remain normal down to 25 millikelvin. The critical field and current-voltage measurements indicate that the superconductivity is two-dimensional. In EuO/KTaO3 (111) samples, a spontaneous in-plane transport anisotropy is observed before the onset of superconductivity, suggesting the emergence of a distinct "stripe"-like phase, which is also revealed near the critical field.
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U2 - 10.1126/science.aba5511
DO - 10.1126/science.aba5511
M3 - Article
C2 - 33479119
SN - 0036-8075
VL - 371
SP - 716
EP - 721
JO - Science (New York, N.Y.)
JF - Science (New York, N.Y.)
IS - 6530
ER -