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  • Letter
  • Open Access

Orbital mixing at the onset of high-temperature superconductivity in FeSe1−xTex/CaF2

K. Nakayama1,2, R. Tsubono1, G. N. Phan1,*, F. Nabeshima3, N. Shikama3, T. Ishikawa3, Y. Sakishita3, S. Ideta4,5, K. Tanaka4,5 et al.

A. Maeda3, T. Takahashi1,6,7, and T. Sato1,6,7

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Tokyo 102-0076, Japan
  • 3Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
  • 4UVSOR Synchrotron Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
  • 5School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Okazaki 444-8585, Japan
  • 6Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
  • 7WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

  • *Present address: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
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Phys. Rev. Research 3, L012007 – Published 20 January, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L012007

Abstract

We perform systematic high-resolution angle-resolved photoemission spectroscopy of iron-chalcogenide superconductor FeSe1−xTex films on CaF2 which exhibit a unique paramagnetic nematicity at x=0 (pristine FeSe) and a gigantic Tc enhancement at the critical Te concentration (xc) of x∼0.2. Upon increasing the Te concentration from x=0, the electronlike Fermi-surface shape at the Brillouin-zone corner shows a clear change associated with a remarkable energy shift of the dxz/yz orbital, indicative of the suppression of nematicity near xc. Evolution of band structure at the Brillouin-zone center is characterized by a drastic upward shift of the dxy band with increasing x, leading to an orbital switching from dxz/yz to dxz/yz+dxy accompanied by a mass enhancement. These results demonstrate that the pristine and high-TcFeSe1−xTex have distinctly different electronic structures. The present study lays the foundation for understanding the origin of high-Tc superconductivity and the interplay with electronic nematicity.

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Phys. Rev. Research 3, L012007– Published 20 January, 2021
  • Received 15 September 2020
  • Revised 5 January 2021
  • Accepted 7 January 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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