Topological Change of the Fermi Surface in Ternary Iron Pnictides with Reduced c/a Ratio: A de Haas–van Alphen Study of CaFe2P2

Amalia I. Coldea, C. M. J. Andrew, J. G. Analytis, R. D. McDonald, A. F. Bangura, J.-H. Chu, I. R. Fisher, and A. Carrington
Phys. Rev. Lett. 103, 026404 – Published 10 July 2009

Abstract

We report a de Haas–van Alphen effect study of the Fermi surface of CaFe2P2 using low-temperature torque magnetometry up to 45 T. This system is a close structural analog of the collapsed tetragonal nonmagnetic phase of CaFe2As2. We find the Fermi surface of CaFe2P2 to differ from other related ternary phosphides in that its topology is highly dispersive in the c axis, being three dimensional in character and with identical mass enhancement on both electron and hole pockets (1.5). This suggests that when the bonding between pnictogen layers becomes important nesting conditions are not fulfilled.

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  • Received 20 May 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.026404

©2009 American Physical Society

Authors & Affiliations

Amalia I. Coldea1, C. M. J. Andrew1, J. G. Analytis2,3, R. D. McDonald4, A. F. Bangura1, J.-H. Chu2,3, I. R. Fisher2,3, and A. Carrington1

  • 1H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
  • 2Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
  • 3Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305-4045, USA
  • 4Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 103, Iss. 2 — 10 July 2009

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