Electron-hole asymmetry in the superconductivity of doped BaFe2As2 seen via the rigid chemical-potential shift in photoemission

M. Neupane, P. Richard, Y.-M. Xu, K. Nakayama, T. Sato, T. Takahashi, A. V. Federov, G. Xu, X. Dai, Z. Fang, Z. Wang, G.-F. Chen, N.-L. Wang, H.-H. Wen, and H. Ding
Phys. Rev. B 83, 094522 – Published 16 March 2011

Abstract

We have performed a systematic photoemission study of the chemical-potential shift as a function of carrier doping in a pnictide system based on BaFe2As2. The experimentally determined chemical-potential shift is consistent with the prediction of a rigid band shift picture by renormalized first-principle band calculations. This leads to an electron-hole asymmetry (EHA) in the Fermi surface (FS) nesting condition due to different effective masses for different FS sheets, which can be calculated from the Lindhard function of susceptibility. This built-in EHA, which matches well the observed asymmetric superconducting domes in the phase diagram, strongly supports FS quasinesting driven superconductivity in iron pnictides.

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  • Received 23 June 2010

DOI:https://doi.org/10.1103/PhysRevB.83.094522

©2011 American Physical Society

Authors & Affiliations

M. Neupane1, P. Richard2,3, Y.-M. Xu1, K. Nakayama4, T. Sato4, T. Takahashi2,4, A. V. Federov5, G. Xu3, X. Dai3, Z. Fang3, Z. Wang1, G.-F. Chen1, N.-L. Wang3, H.-H. Wen3, and H. Ding3

  • 1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
  • 2WPI Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 5Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

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Issue

Vol. 83, Iss. 9 — 1 March 2011

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