Pnictides as frustrated quantum antiferromagnets close to a quantum phase transition

Götz S. Uhrig, Michael Holt, Jaan Oitmaa, Oleg P. Sushkov, and Rajiv R. P. Singh
Phys. Rev. B 79, 092416 – Published 23 March 2009

Abstract

We present a detailed description of the dynamics of the magnetic modes in the recently discovered superconducting pnictides using reliable self-consistent spin-wave theory and series expansion. Contrary to linear spin-wave theory, no gapless mode occurs at the Néel wave vector. We discuss the scenario that the static magnetic moment is strongly reduced by magnetic fluctuations arising from the vicinity to a quantum phase transition. Smoking gun experiments to verify this scenario are proposed and possible results are predicted. Intriguingly in this scenario, the structural transition at finite temperature would be driven by an Ising transition in directional degrees of freedom.

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  • Received 23 January 2009

DOI:https://doi.org/10.1103/PhysRevB.79.092416

©2009 American Physical Society

Authors & Affiliations

Götz S. Uhrig*,†, Michael Holt, Jaan Oitmaa, and Oleg P. Sushkov

  • School of Physics, University of New South Wales, Kensington 2052 Sydney, New South Wales, Australia

Rajiv R. P. Singh

  • University of California, Davis, California 95616, USA

  • *goetz.uhrig@tu-dortmund.de
  • On leave from Lehrstuhl für Theoretische Physik I, Technische Universität Dortmund, Otto-Hahn Straße 4, 44221 Dortmund, Germany.

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Issue

Vol. 79, Iss. 9 — 1 March 2009

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