Evolution of the Fermi Surface of BaFe2(As1xPx)2 on Entering the Superconducting Dome

H. Shishido, A. F. Bangura, A. I. Coldea, S. Tonegawa, K. Hashimoto, S. Kasahara, P. M. C. Rourke, H. Ikeda, T. Terashima, R. Settai, Y. Ōnuki, D. Vignolles, C. Proust, B. Vignolle, A. McCollam, Y. Matsuda, T. Shibauchi, and A. Carrington
Phys. Rev. Lett. 104, 057008 – Published 5 February 2010

Abstract

Using the de Haas–van Alphen effect we have measured the evolution of the Fermi surface of BaFe2(As1xPx)2 as a function of isoelectric substitution (As/P) for 0.41<x<1 (Tc up to 25 K). We find that the volumes of electron and hole Fermi surfaces shrink linearly with decreasing x. This shrinking is accompanied by a strong increase in the quasiparticle effective mass as x is tuned toward the maximum Tc. These results are not explained by simple band structure calculations, and it is likely that these trends originate from the same many-body interactions which give rise to superconductivity.

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  • Received 20 October 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.057008

©2010 American Physical Society

Authors & Affiliations

H. Shishido1,2, A. F. Bangura3, A. I. Coldea3, S. Tonegawa1, K. Hashimoto1, S. Kasahara2, P. M. C. Rourke3, H. Ikeda1, T. Terashima2, R. Settai4, Y. Ōnuki4, D. Vignolles5, C. Proust5, B. Vignolle5, A. McCollam6, Y. Matsuda1, T. Shibauchi1, and A. Carrington3

  • 1Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
  • 2Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
  • 3H. H. Wills Physics Laboratory, Bristol University, Tyndall Avenue, BS8 1TL, United Kingdom
  • 4Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • 5Laboratoire National des Champs Magnétiques Intenses (CNRS), Toulouse, France
  • 6High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands

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Vol. 104, Iss. 5 — 5 February 2010

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