Publication Date:
2015-04-03
Description:
We report crystallographic and magnetic properties of layered iron oxypnictide CeFe 1− x Cr x PO ( x = 0.000–0.692). Interlayer distances between Ce 2 O 2 and (Fe 1− x Cr x ) 2 P 2 layers increase as a function of x , suggesting suppression of Kondo coupling among hybridized conducting orbitals and localized Ce 4 f orbitals. CeFe 1− x Cr x PO ( x = 0.100–0.384) exhibits finite ferromagnetic transition temperatures ( T c u r i e ) obtained by Arrott plots, although 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 1− x Cr x PO appear at 0.045 ≤ x ≤ 0.100 and 0.384 ≤ x ≤ 0.500.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
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