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

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.
Authors:
; ;  [1] ; ;  [2] ; ;  [3]
  1. Department of Applied Physics and Department of Physico-Informatics, Faculty of Science and Technology, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522 (Japan)
  2. Research Reactor Institute, Kyoto University, Kumatori-cho, Senngan-gun, Osaka 590-0494 (Japan)
  3. Materials and Structures Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226-8503 (Japan)
Publication Date:
OSTI Identifier:
22410138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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