Atomistic origin of an ordered superstructure induced superconductivity in layered chalcogenides

R. Ang, Z. C. Wang (), C. L. Chen (), J. Tang, N. Liu, Y. Liu, W. J. Lu, Y. P. Sun, T. Mori () and Y. Ikuhara
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R. Ang: National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA)
Z. C. Wang: Advanced Institute for Materials Research, Tohoku University
C. L. Chen: Advanced Institute for Materials Research, Tohoku University
J. Tang: Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University
N. Liu: Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University
Y. Liu: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences
W. J. Lu: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences
Y. P. Sun: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences
T. Mori: National Institute for Materials Science (NIMS), International Center for Materials Nanoarchitechtonics (MANA)
Y. Ikuhara: Advanced Institute for Materials Research, Tohoku University

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Interplay among various collective electronic states such as charge density wave and superconductivity is of tremendous significance in low-dimensional electron systems. However, the atomistic and physical nature of the electronic structures underlying the interplay of exotic states, which is critical to clarifying its effect on remarkable properties of the electron systems, remains elusive, limiting our understanding of the superconducting mechanism. Here, we show evidence that an ordering of selenium and sulphur atoms surrounding tantalum within star-of-David clusters can boost superconductivity in a layered chalcogenide 1T-TaS2−xSex, which undergoes a superconducting transition in the nearly commensurate charge density wave phase. Advanced electron microscopy investigations reveal that such an ordered superstructure forms only in the x area, where the superconductivity manifests, and is destructible to the occurrence of the Mott metal–insulator transition. The present findings provide a novel dimension in understanding the relationship between lattice and electronic degrees of freedom.

Date: 2015
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DOI: 10.1038/ncomms7091

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