Phonon spectra of PrFeAsO 1-y via inelastic x-ray scattering

Tatsuo Fukuda, Alfred Q.R. Baron, Hiroki Nakamura, S. I. Shamoto, Motoyuki Ishikado, Masahiko Machida, Hiroshi Uchiyama, Akira Iyo, Hijiri Kito, Jun'ichiro Mizuki, Masatoshi Arai, Hiroshi Eisaki

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1 Citation (Scopus)

Abstract

Phonons in single crystals of PrFeAsO 1-y are investigated using high-resolution inelastic x-ray scattering (IXS) and ab-initio pseudo-potential calculations. Extensive measurements show some changes in phonon spectra with temperature and/or doping. However, comparing our measurements with several ab-initio calculations we find that the experimentally observed changes are much smaller than differences between the experimental data and the calculations. Here we add to our previous work [Fukuda et al.: Phys. Rev. B 84 (2011) 064504] by showing more of the IXS spectra and details of some of the calculations. Agreement is improved if magnetism is included in the calculations, but still large disagreement remains. Several modifications of the calculations are considered and the best agreement is obtained from modifying the non-magnetic model by softening only the in-plane nearest-neighbor Fe-As force constant.

Original languageEnglish
Article numberSB015
JournalJournal of the Physical Society of Japan
Volume80
Issue numberSUPPL. B
DOIs
Publication statusPublished - 2011 Dec

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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