Bandwidth and Electron Correlation-Tuned Superconductivity in Rb0.8Fe2(Se1zSz)2

M. Yi, Meng Wang, A. F. Kemper, S.-K. Mo, Z. Hussain, E. Bourret-Courchesne, A. Lanzara, M. Hashimoto, D. H. Lu, Z.-X. Shen, and R. J. Birgeneau
Phys. Rev. Lett. 115, 256403 – Published 15 December 2015
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Abstract

We present a systematic angle-resolved photoemission spectroscopy study of the substitution dependence of the electronic structure of Rb0.8Fe2(Se1zSz)2 (z=0, 0.5, 1), where superconductivity is continuously suppressed into a metallic phase. Going from the nonsuperconducting Rb0.8Fe2S2 to superconducting Rb0.8Fe2Se2, we observe little change of the Fermi surface topology, but a reduction of the overall bandwidth by a factor of 2. Hence, for these heavily electron-doped iron chalcogenides, we have identified electron correlation as explicitly manifested in the quasiparticle bandwidth to be the important tuning parameter for superconductivity, and that moderate correlation is essential to achieving high TC.

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  • Received 25 March 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.256403

© 2015 American Physical Society

Authors & Affiliations

M. Yi1,*, Meng Wang1,†, A. F. Kemper2, S.-K. Mo3, Z. Hussain3, E. Bourret-Courchesne4, A. Lanzara1,4, M. Hashimoto5, D. H. Lu5, Z.-X. Shen6,7, and R. J. Birgeneau1,4,8

  • 1Department of Physics, University of California Berkeley, Berkeley, California 94720, USA
  • 2Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 4Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 6Stanford Institute of Materials and Energy Sciences, Stanford University, Stanford, California 94305, USA
  • 7Departments of Physics and Applied Physics, and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
  • 8Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA

  • *mingyi@berkeley.edu
  • wangm@berkeley.edu

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Vol. 115, Iss. 25 — 18 December 2015

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