A ferromagnetic quantum critical point in heavy-fermion iron oxypnictide CeFe{sub 1−x}Cr{sub x}PO

Journal Article · Thu May 07 04:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4916808· OSTI ID:22410138

Okano, T.; Matoba, M.; Kitao, S.; Seto, M. ^[1]; Atou, T.; Itoh, M. ^[2]

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1. Research Reactor Institute, Kyoto University, Kumatori-cho, Senngan-gun, Osaka 590-0494 (Japan)
2. Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan)

We report crystallographic and magnetic properties of layered iron oxypnictide CeFe{sub 1−x}Cr{sub x}PO (x = 0.000–0.692). Interlayer distances between Ce{sub 2}O{sub 2} and (Fe{sub 1−x}Cr{sub x}){sub 2}P{sub 2} layers increase as a function of x, suggesting suppression of Kondo coupling among hybridized conducting orbitals and localized Ce 4f orbitals. CeFe{sub 1−x}Cr{sub x}PO (x = 0.100–0.384) exhibits finite ferromagnetic transition temperatures (T{sub curie}) obtained by Arrott plots, although {sup 57}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{sub 1−x}Cr{sub x}PO appear at 0.045 ≤ x ≤ 0.100 and 0.384 ≤ x ≤ 0.500.

• OSTI ID: 22410138
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 17 Vol. 117; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERIUM COMPOUNDS
CHROMIUM PHOSPHATES
CONCENTRATION RATIO
COUPLING
FERMIONS
FERROMAGNETIC MATERIALS
FERROMAGNETISM
IRON
IRON 57
IRON COMPOUNDS
LAYERS
MAGNETIC PROPERTIES
MOESSBAUER EFFECT
PARAMAGNETISM
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE