Paramagnetic phase of a heavy-fermion compound, CeFePO, probed by< 57Fe mössbauer spectroscopy

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Abstract

57Fe Mössbauer spectroscopy was applied to an iron-based layered compound CeFePO. At temperatures from 9.4 to 293 K, no magnetic splitting was observed in the Mössbauer spectra of CeFePO indicating a paramagnetic phase of the Fe magnetic sublattice. All the spectra were fitted with a small quadrupole splitting, and the Debye temperature of CeFePO was found to be ∼448 K. The isomer shift at room temperature, 0.32 mm/s, was almost equal to those of LnFeAsO (Ln = La, Ce, Sm). Comparing s-electron density using the isomer shifts and unit cell volumes, it was found that the Fe of CeFePO has a similar valence state to other layered iron-based quaternary oxypnictides except LaFePO.

Original languageEnglish
Article number064714
JournalJournal of the Physical Society of Japan
Volume81
Issue number6
DOIs
Publication statusPublished - 2012 Jun

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isomers
fermions
iron
shift
spectroscopy
sublattices
quadrupoles
specific heat
valence
room temperature
cells
temperature

Keywords

  • Fe Mössbauer spectroscopy
  • CeFeAsO
  • CeFePO
  • Heavy fermion
  • Layered compounds

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

@article{906d7d39820547048b152c6832ce020a,
title = "Paramagnetic phase of a heavy-fermion compound, CeFePO, probed by< 57Fe m{\"o}ssbauer spectroscopy",
abstract = "57Fe M{\"o}ssbauer spectroscopy was applied to an iron-based layered compound CeFePO. At temperatures from 9.4 to 293 K, no magnetic splitting was observed in the M{\"o}ssbauer spectra of CeFePO indicating a paramagnetic phase of the Fe magnetic sublattice. All the spectra were fitted with a small quadrupole splitting, and the Debye temperature of CeFePO was found to be ∼448 K. The isomer shift at room temperature, 0.32 mm/s, was almost equal to those of LnFeAsO (Ln = La, Ce, Sm). Comparing s-electron density using the isomer shifts and unit cell volumes, it was found that the Fe of CeFePO has a similar valence state to other layered iron-based quaternary oxypnictides except LaFePO.",
keywords = "Fe M{\"o}ssbauer spectroscopy, CeFeAsO, CeFePO, Heavy fermion, Layered compounds",
author = "Tetsur Nakamura and Takashi Yamamoto and Masanori Matoba and Yasuaki Einaga and Yoichi Kamihara",
year = "2012",
month = "6",
doi = "10.1143/JPSJ.81.064714",
language = "English",
volume = "81",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "6",

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TY - JOUR

T1 - Paramagnetic phase of a heavy-fermion compound, CeFePO, probed by< 57Fe mössbauer spectroscopy

AU - Nakamura, Tetsur

AU - Yamamoto, Takashi

AU - Matoba, Masanori

AU - Einaga, Yasuaki

AU - Kamihara, Yoichi

PY - 2012/6

Y1 - 2012/6

N2 - 57Fe Mössbauer spectroscopy was applied to an iron-based layered compound CeFePO. At temperatures from 9.4 to 293 K, no magnetic splitting was observed in the Mössbauer spectra of CeFePO indicating a paramagnetic phase of the Fe magnetic sublattice. All the spectra were fitted with a small quadrupole splitting, and the Debye temperature of CeFePO was found to be ∼448 K. The isomer shift at room temperature, 0.32 mm/s, was almost equal to those of LnFeAsO (Ln = La, Ce, Sm). Comparing s-electron density using the isomer shifts and unit cell volumes, it was found that the Fe of CeFePO has a similar valence state to other layered iron-based quaternary oxypnictides except LaFePO.

AB - 57Fe Mössbauer spectroscopy was applied to an iron-based layered compound CeFePO. At temperatures from 9.4 to 293 K, no magnetic splitting was observed in the Mössbauer spectra of CeFePO indicating a paramagnetic phase of the Fe magnetic sublattice. All the spectra were fitted with a small quadrupole splitting, and the Debye temperature of CeFePO was found to be ∼448 K. The isomer shift at room temperature, 0.32 mm/s, was almost equal to those of LnFeAsO (Ln = La, Ce, Sm). Comparing s-electron density using the isomer shifts and unit cell volumes, it was found that the Fe of CeFePO has a similar valence state to other layered iron-based quaternary oxypnictides except LaFePO.

KW - Fe Mössbauer spectroscopy

KW - CeFeAsO

KW - CeFePO

KW - Heavy fermion

KW - Layered compounds

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