Effect of Uniaxial Strain on the Structural and Magnetic Phase Transitions in BaFe2As2
Journal Article
·
· Physical Review Letters
- Boston College, Chestnut Hill
- Canadian Neutron Beam Centre, National Research Council, Chalk River Laboratorie
- University of Tennessee, Knoxville (UTK)
- Ames Laboratory and Iowa State University
- ORNL
- University of California, Berkeley
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
- Sponsoring Organization:
- SC USDOE - Office of Science (SC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1037684
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 108; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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