Abstract
We report crystallographic and magnetic properties of layered iron oxypnictide CeFe1−xCrxPO (x = 0.000–0.692). Interlayer distances between Ce2O2 and (Fe1−xCrx)2P2 layers increase as a function of x, suggesting suppression of Kondo coupling among hybridized conducting orbitals and localized Ce 4f orbitals. CeFe1−xCrxPO (x = 0.100–0.384) exhibits finite ferromagnetic transition temperatures (Tcurie) obtained by Arrott plots, although 57Fe 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 CeFe1−xCrxPO appear at 0.045 ≤ x ≤ 0.100 and 0.384 ≤ x ≤ 0.500.
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