Effect of magnetism on lattice dynamics in iron-based superconductors as seen via high-resolution inelastic X-ray scattering

Murai, Naoki ; Fukuda, Tatsuo ; Tajima, Setsuko*; Baron, A. Q. R.*

Phonon spectra of detwinned SrFe $_{2}$ As $_{2}$ crystals, as measured by inelastic X-ray scattering, show clear anisotropy accompanying the magneto-structural transition at 200 K. We model the modesplitting using magnetic DFT calculations, including a phenomenological reduction in force-constant anisotropy that can be attributed to magnetic fluctuations. This serves as a starting point for a general model of phonons in this material applicable to both magnetic and non-magnetic phase.

Language	:	Japanese
Journal	:	Hoshako
Volume	:	32
Number	:	4
Pages	:	p.199 - 208
Publication Year/Month	:	2019/07
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Keywords	:	超伝導; 格子ダイナミクス; 放射光分光
Research Facility	:	SPring-8(大型放射光施設)
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Cooperating Institute	:	大阪大学; 理化学研究所

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Registration No. : AA20190210
JAEA Abstracts No. :
Paper Submission No. : 29385

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