Close correlation between magnetic properties and the soft phonon mode of the structural transition in BaFe2As2 and SrFe2As2

Parshall, D.; Pintschovius, L.; Niedziela, Jennifer L.; Castellan, J. -P.; Lamago, D.; Mittal, R.; Wolf, Th.; Reznik, Dmitry

doi:10.1103/PhysRevB.91.134426

Title: Close correlation between magnetic properties and the soft phonon mode of the structural transition in ${BaFe}_{2} {As}_{2}$ and ${SrFe}_{2} {As}_{2}$

Journal Article · Mon Apr 27 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.134426· OSTI ID:1185763

Parshall, D. ^[1]; Pintschovius, L. ^[2]; Niedziela, Jennifer L. ^[3]; Castellan, J. -P. ^[4]; Lamago, D. ^[2]; Mittal, R. ^[5]; Wolf, Th. ^[2]; Reznik, Dmitry ^[6]

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 ${BaFe}_{2} {As}_{2}$ and ${SrFe}_{2} {As}_{2}$ . 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.

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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

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Cited by: 16 works

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References (34)

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Effect of magnetism on lattice dynamics in ${SrFe}_{2} {As}_{2}$ using high-resolution inelastic x-ray scattering Murai, N.; Fukuda, T.; Kobayashi, T. Physical Review B, Vol. 93, Issue 2 https://doi.org/10.1103/physrevb.93.020301	journal	January 2016

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