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Suppression of antiferromagnetic spin fluctuations in the collapsed phase of CaFe2As2

D. K. Pratt, Y. Zhao, S. A. J. Kimber, A. Hiess, D. N. Argyriou, C. Broholm, A. Kreyssig, S. Nandi, S. L. Bud’ko, N. Ni, P. C. Canfield, R. J. McQueeney, and A. I. Goldman
Phys. Rev. B 79, 060510(R) – Published 27 February 2009

Abstract

Inelastic neutron-scattering measurements of CaFe2As2 under applied hydrostatic pressure show that the antiferromagnetic spin fluctuations observed in the ambient pressure, paramagnetic, and tetragonal (T) phase are strongly suppressed, if not absent, in the collapsed tetragonal (cT) phase. These results are consistent with a quenched Fe moment in the cT phase and the strong decrease in resistivity observed upon crossing the boundary from the T to cT phases. The suppression or absence of static antiferromagnetic order and dynamic spin fluctuations in the nonsuperconducting cT phase supports the notion of a coupling between spin fluctuations and superconductivity in the iron arsenides.

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  • Received 20 January 2009

DOI:https://doi.org/10.1103/PhysRevB.79.060510

©2009 American Physical Society

Authors & Affiliations

D. K. Pratt1,2, Y. Zhao3, S. A. J. Kimber4, A. Hiess5, D. N. Argyriou4, C. Broholm3, A. Kreyssig1,2, S. Nandi1,2, S. L. Bud’ko1,2, N. Ni1,2, P. C. Canfield1,2, R. J. McQueeney1,2, and A. I. Goldman1,2

  • 1Ames Laboratory, US DOE, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 4Helmholtz-Zentrum Berlin für Materialien und Energie, Glienicker Straße 100, 14109 Berlin, Germany
  • 5Institut Laue-Langevin, 38042 Grenoble Cedex, France

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Issue

Vol. 79, Iss. 6 — 1 February 2009

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