Dependence of electron correlation strength in Fe1+yTe1xSex on Se content

L. C. C. Ambolode, II, K. Okazaki, M. Horio, H. Suzuki, L. Liu, S. Ideta, T. Yoshida, T. Mikami, T. Kakeshita, S. Uchida, K. Ono, H. Kumigashira, M. Hashimoto, D.-H. Lu, Z.-X. Shen, and A. Fujimori
Phys. Rev. B 92, 035104 – Published 2 July 2015

Abstract

The iron chalcogenide Fe1+yTe1xSex on the Te-rich side is known to exhibit the strongest electron correlations among the Fe-based superconductors and is nonsuperconducting for x<0.1. In order to understand the origin of such behaviors, we have performed angle-resolved photoemission spectroscopy studies of Fe1+yTe1xSex (x=0,0.1,0.2,and0.4). The obtained mass renormalization factors for different energy bands are qualitatively consistent with density functional theory and dynamical mean-field theory calculations. Our results provide evidence for strong orbital dependence of mass renormalization and systematic data which help us to resolve inconsistencies with other experimental data. The unusually strong orbital dependence of mass renormalization in Te-rich Fe1+yTe1xSex arises from the dominant contribution to the Fermi surface of the dxy band, which is the most strongly correlated and may contribute to the suppression of superconductivity.

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  • Received 27 April 2015
  • Revised 29 May 2015

DOI:https://doi.org/10.1103/PhysRevB.92.035104

©2015 American Physical Society

Authors & Affiliations

L. C. C. Ambolode, II1,*, K. Okazaki1, M. Horio1, H. Suzuki1, L. Liu1, S. Ideta1, T. Yoshida1, T. Mikami1, T. Kakeshita1, S. Uchida1, K. Ono2, H. Kumigashira2, M. Hashimoto3, D.-H. Lu3, Z.-X. Shen4,5, and A. Fujimori1

  • 1Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
  • 2Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305–0801, Japan
  • 3Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 4Stanford Institute of Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 5Departments of Physics and Applied Physics, and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA

  • *Present address: Physics Department, Mindanao State University-Iligan Institute of Technology 9200 Iligan City, Philippines.

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Issue

Vol. 92, Iss. 3 — 15 July 2015

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