Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent BaFe2As2 Compound of FeAs-Based High-Temperature Superconductors

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Q. Huang
  • Y. Qiu
  • M. A. Green
  • J. W. Lynn
  • Y. C. Gasparovic
  • T. Wu
  • G. Wu
  • X. H. Chen

Detail(s)

Original languageEnglish
Article number257003
Journal / PublicationPhysical Review Letters
Volume101
Issue number25
Online published17 Dec 2008
Publication statusPublished - 19 Dec 2008
Externally publishedYes

Abstract

The recent discovery of superconductivity in (Ba,K)Fe2As2, which crystallizes in the ThCr2Si2 (122) structure as compared with the LnFeAsO (Ln is lanthanide) systems that possess the ZrCuSiAs (1111) structure, demonstrates the exciting potential of the FeAs-based materials for high-TC superconductivity. Here we report neutron diffraction studies that show a tetragonal-to-orthorhombic distortion associated with the onset of = (101) antiferromagnetic order in BaFe2As2, with a saturation moment 0.87(3)μB per Fe that is orientated along the longer a axis of the ab planes. The simultaneous first-order structural and magnetic transition is in contrast with the separated transitions previously reported in the 1111-type materials. The orientational relation between magnetic alignment and lattice distortion supports a multiorbital nature for the magnetic order.

Citation Format(s)

Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent BaFe2As2 Compound of FeAs-Based High-Temperature Superconductors. / Huang, Q.; Qiu, Y.; Bao, Wei et al.
In: Physical Review Letters, Vol. 101, No. 25, 257003, 19.12.2008.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review