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Possible role of bonding angle and orbital mixing in iron pnictide superconductivity: Comparative electronic structure studies of LiFeAs and Sr2VO3FeAs

Y. K. Kim, Y. Y. Koh, W. S. Kyung, G. R. Han, B. Lee, Kee Hoon Kim, J. M. Ok, Jun Sung Kim, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S.-K. Mo, and C. Kim
Phys. Rev. B 92, 041116(R) – Published 27 July 2015

Abstract

A well-known universal feature among iron pnictide superconductors is the correlation between the As-Fe-As bonding angle and the superconducting transition temperature. However, the origin of such a correlation has not been clearly understood despite its potential importance in understanding the mechanism of superconductivity. Here, we present comparative electronic structure studies of LiFeAs and Sr2VO3FeAs, two representative systems without any dopant that can show bonding angle dependence of the electronic structure. Captured distinct features of the higher Tc compound Sr2VO3FeAs such as an unusual kz modulation and anomalous polarization dependence suggest that the difference between the two systems is in the interorbital coupling strength. This could be the essential element of the bonding angle dependence that allows an enhanced pairing instability and Tc.

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  • Received 12 August 2014
  • Revised 1 June 2015

DOI:https://doi.org/10.1103/PhysRevB.92.041116

©2015 American Physical Society

Authors & Affiliations

Y. K. Kim1,2, Y. Y. Koh1, W. S. Kyung1, G. R. Han1, B. Lee3, Kee Hoon Kim3, J. M. Ok4, Jun Sung Kim4, M. Arita5, K. Shimada5, H. Namatame5, M. Taniguchi5, S.-K. Mo2, and C. Kim1,*

  • 1Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea
  • 2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 3CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
  • 4Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 5Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan

  • *changyoung@yonsei.ac.kr

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Issue

Vol. 92, Iss. 4 — 15 July 2015

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