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Tuning magnetism in FeAs-based materials via a tetrahedral structure

K. Kirshenbaum, N. P. Butch, S. R. Saha, P. Y. Zavalij, B. G. Ueland, J. W. Lynn, and J. Paglione
Phys. Rev. B 86, 060504(R) – Published 8 August 2012
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Abstract

Resistivity, magnetic susceptibility, neutron scattering, and x-ray crystallography measurements were used to study the evolution of magnetic order and crystallographic structure in single-crystal samples of the Ba1xSrxFe2As2 and Sr1yCayFe2As2 series. A nonmonotonic dependence of the magnetic ordering temperature T0 on chemical pressure is compared to the progression of the antiferromagnetic staggered moment, characteristics of the ordering transition, and structural parameters to reveal a distinct relationship between the magnetic energy scale and the tetrahedral bond angle, even far above T0. In Sr1yCayFe2As2, an abrupt drop in T0 precisely at the Ca concentration where the tetrahedral structure approaches the ideal geometry indicates a strong coupling between the orbital bonding structure and the stabilization of magnetic order, providing strong constraints on the nature of magnetism in the iron-arsenide superconducting parent compounds.

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  • Received 23 February 2012

DOI:https://doi.org/10.1103/PhysRevB.86.060504

©2012 American Physical Society

Authors & Affiliations

K. Kirshenbaum1, N. P. Butch1, S. R. Saha1, P. Y. Zavalij2, B. G. Ueland3, J. W. Lynn3, and J. Paglione1,*

  • 1Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 2Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
  • 3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

  • *paglione@umd.edu

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Issue

Vol. 86, Iss. 6 — 1 August 2012

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