Close correlation between magnetic properties and the soft phonon mode of the structural transition in and
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
- Karlsruhe Inst. of Technology (KIT) (Germany). Inst. of Solid State Physics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument and Source Division
- Karlsruhe Inst. of Technology (KIT) (Germany). Inst. of Solid State Physics; Alternative Energies and Atomic Energy Commission (CEA), Saclay (France). Lab. L'eon Brillouin
- Bhabha Atomic Research Centre (BARC), Mumbai (India). Solid State Physics Division
- Univ. of Colorado, Boulder, CO (United States). Dept. of Physics
Parent compounds of Fe-based superconductors undergo a structural phase transition from a tetragonal to an orthorhombic structure. We investigated the temperature dependence of the frequencies of TA phonons that extrapolate to the shear vibrational mode at the zone center, which corresponds to the orthorhombic deformation of the crystal structure at low temperatures in and . We found that acoustic phonons at small wave vectors soften gradually towards the transition from high temperatures, tracking the increase of the size of slowly fluctuating magnetic domains. On cooling below the transition to base temperature the phonons harden, following the square of the magnetic moment (which we find is proportional to the anisotropy gap). Finally, our results provide evidence for close correlation between magnetic and phonon properties in Fe-based superconductors.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; SC0006939
- OSTI ID:
- 1185763
- Alternate ID(s):
- OSTI ID: 1178781
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 13; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Effect of magnetism on lattice dynamics in using high-resolution inelastic x-ray scattering
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journal | January 2016 |
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