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Title: Effect of Uniaxial Strain on the Structural and Magnetic Phase Transitions in BaFe2As2

We report neutron scattering experiments probing the influence of uniaxial strain on both the magnetic and structural order parameters in the parent iron pnictide compound, BaFe{sub 2}As{sub 2}. Our data show that modest strain fields along the in-plane orthorhombic b axis can affect significant changes in phase behavior simultaneous to the removal of structural twinning effects. As a result, we demonstrate in BaFe{sub 2}As{sub 2} samples detwinned via uniaxial strain that the in-plane C{sub 4} symmetry is broken by both the structural lattice distortion and long-range spin ordering at temperatures far above the nominal (strain-free) phase transition temperatures. Surprising changes in the magnetic order parameter of this system under relatively small strain fields also suggest the inherent presence of magnetic domains fluctuating above the strain-free ordering temperature in this material.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [6] ;  [1]
  1. Boston College, Chestnut Hill
  2. Canadian Neutron Beam Centre, National Research Council, Chalk River Laboratorie
  3. University of Tennessee, Knoxville (UTK)
  4. Ames Laboratory and Iowa State University
  5. ORNL
  6. University of California, Berkeley
Publication Date:
OSTI Identifier:
1037684
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 108; Journal Issue: 8
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Flux Isotope Reactor
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARSENIC COMPOUNDS; BARIUM COMPOUNDS; IRON COMPOUNDS; MAGNETIC PROPERTIES; NEUTRON DIFFRACTION; ORDER PARAMETERS; PHASE TRANSFORMATIONS; PNICTIDES; REMOVAL; SCATTERING; SPIN; STRAINS; SYMMETRY; TRANSITION TEMPERATURE; TWINNING