Close correlation between magnetic properties and the soft phonon mode of the structural transition in and
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1185763
- Alternate Identifier(s):
- OSTI ID: 1178781
- Grant/Contract Number:
- AC05-00OR22725; SC0006939
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 13; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Parshall, D., Pintschovius, L., Niedziela, Jennifer L., Castellan, J. -P., Lamago, D., Mittal, R., Wolf, Th., and Reznik, Dmitry. Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe2As2 and SrFe2As2. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.91.134426.
Parshall, D., Pintschovius, L., Niedziela, Jennifer L., Castellan, J. -P., Lamago, D., Mittal, R., Wolf, Th., & Reznik, Dmitry. Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe2As2 and SrFe2As2. United States. https://doi.org/10.1103/PhysRevB.91.134426
Parshall, D., Pintschovius, L., Niedziela, Jennifer L., Castellan, J. -P., Lamago, D., Mittal, R., Wolf, Th., and Reznik, Dmitry. Mon .
"Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe2As2 and SrFe2As2". United States. https://doi.org/10.1103/PhysRevB.91.134426. https://www.osti.gov/servlets/purl/1185763.
@article{osti_1185763,
title = {Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe2As2 and SrFe2As2},
author = {Parshall, D. and Pintschovius, L. and Niedziela, Jennifer L. and Castellan, J. -P. and Lamago, D. and Mittal, R. and Wolf, Th. and Reznik, Dmitry},
abstractNote = {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 BaFe2As2 and SrFe2As2. 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.},
doi = {10.1103/PhysRevB.91.134426},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 13,
volume = 91,
place = {United States},
year = {Mon Apr 27 00:00:00 EDT 2015},
month = {Mon Apr 27 00:00:00 EDT 2015}
}
Web of Science
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Works referencing / citing this record:
Effect of magnetism on lattice dynamics in using high-resolution inelastic x-ray scattering
journal, January 2016
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