Neutron scattering study of the interplay between structure and magnetism in Ba(Fe1xCox)2As2

C. Lester, Jiun-Haw Chu, J. G. Analytis, S. C. Capelli, A. S. Erickson, C. L. Condron, M. F. Toney, I. R. Fisher, and S. M. Hayden
Phys. Rev. B 79, 144523 – Published 23 April 2009; Erratum Phys. Rev. B 80, 229901 (2009)

Abstract

Single-crystal neutron diffraction is used to investigate the magnetic and structural phase diagrams of the electron-doped superconductor Ba(Fe1xCox)2As2. Heat-capacity and resistivity measurements have demonstrated that Co doping this system splits the combined antiferromagnetic and structural transition present in BaFe2As2 into two distinct transitions. For x=0.025, we find that the upper transition is between the high-temperature tetragonal and low-temperature orthorhombic structures with (TTO=99±0.5K) and the antiferromagnetic transition occurs at TAF=93±0.5K. We find that doping rapidly suppresses the antiferromagnetism, with antiferromagnetic order disappearing at x0.055. However, there is a region of coexistence of antiferromagnetism and signatures of superconductivity obtained from thermodynamic and transport properties. For all the compositions studied, we find two anomalies in the temperature dependence of the structural Bragg peaks from both neutron scattering and x-ray diffraction at the same temperatures where anomalies in the heat capacity and resistivity have been previously identified. Thus for x=0.025, where we have shown that the lower anomaly occurs at TAF, we infer that there is strong coupling between the antiferromagnetism and the crystal lattice which may persist to larger x.

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  • Received 22 March 2009

DOI:https://doi.org/10.1103/PhysRevB.79.144523

©2009 American Physical Society

Erratum

Erratum: Neutron scattering study of the interplay between structure and magnetism in Ba(Fe1xCox)2As2 [Phys. Rev. B 79, 144523 (2009)]

C. Lester, Jiun-Haw Chu, J. G. Analytis, S. C. Capelli, A. S. Erickson, C. L. Condron, M. F. Toney, I. R. Fisher, and S. M. Hayden
Phys. Rev. B 80, 229901 (2009)

Authors & Affiliations

C. Lester1, Jiun-Haw Chu2,3, J. G. Analytis2,3, S. C. Capelli4, A. S. Erickson2,3, C. L. Condron5, M. F. Toney5, I. R. Fisher2,3, and S. M. Hayden1

  • 1H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
  • 2Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
  • 3Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
  • 4Institut Laue-Langevin, 38042 Grenoble, France
  • 5Stanford Synchrotron Radiation Laboratory, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA

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Issue

Vol. 79, Iss. 14 — 1 April 2009

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