A ferromagnetic quantum critical point in heavy-fermion iron oxypnictide CeFe<inf>1-</inf><inf>x</inf>Cr<inf>x</inf>PO

T. Okano, S. Kitao, M. Seto, T. Atou, M. Itoh, Masanori Matoba, Yoichi Kamihara

Research output: Contribution to journalArticle

Abstract

We report crystallographic and magnetic properties of layered iron oxypnictide CeFe<inf>1-</inf><inf>x</inf>Cr<inf>x</inf>PO (x = 0.000-0.692). Interlayer distances between Ce<inf>2</inf>O<inf>2</inf> and (Fe<inf>1-</inf><inf>x</inf>Cr<inf>x</inf>)<inf>2</inf>P<inf>2</inf> layers increase as a function of x, suggesting suppression of Kondo coupling among hybridized conducting orbitals and localized Ce 4f orbitals. CeFe<inf>1-</inf><inf>x</inf>Cr<inf>x</inf>PO (x = 0.100-0.384) exhibits finite ferromagnetic transition temperatures (Tcurie) obtained by Arrott plots, although <sup>57</sup>Fe Mössbauer spectra reveal paramagnetic Fe sublattice at T 4.2 K. These results indicate that the ferromagnetic phase transitions of samples are mainly due to Ce sublattice. For the samples with x ≥ 0.500, no ferromagnetic order is observed down to 2 K. These results verify that ferromagnetic quantum critical points of CeFe<inf>1-</inf><inf>x</inf>Cr<inf>x</inf>PO appear at 0.045 ≤ x ≤ 0.100 and 0.384 ≤ x ≤ 0.500.

Original languageEnglish
Article number17E123
JournalJournal of Applied Physics
Volume117
Issue number17
DOIs
Publication statusPublished - 2015 May 7

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sublattices
critical point
fermions
iron
orbitals
interlayers
plots
transition temperature
retarding
magnetic properties
conduction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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A ferromagnetic quantum critical point in heavy-fermion iron oxypnictide CeFe<inf>1-</inf><inf>x</inf>Cr<inf>x</inf>PO. / Okano, T.; Kitao, S.; Seto, M.; Atou, T.; Itoh, M.; Matoba, Masanori; Kamihara, Yoichi.

In: Journal of Applied Physics, Vol. 117, No. 17, 17E123, 07.05.2015.

Research output: Contribution to journalArticle

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AU - Itoh, M.

AU - Matoba, Masanori

AU - Kamihara, Yoichi

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