### 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 language | English |
---|---|

Article number | 17E123 |

Journal | Journal of Applied Physics |

Volume | 117 |

Issue number | 17 |

DOIs | |

Publication status | Published - 2015 May 7 |

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### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Journal of Applied Physics*,

*117*(17), [17E123]. https://doi.org/10.1063/1.4916808

**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.

Research output: Contribution to journal › Article

*Journal of Applied Physics*, vol. 117, no. 17, 17E123. https://doi.org/10.1063/1.4916808

}

TY - JOUR

T1 - A ferromagnetic quantum critical point in heavy-fermion iron oxypnictide CeFe1-xCrxPO

AU - Okano, T.

AU - Kitao, S.

AU - Seto, M.

AU - Atou, T.

AU - Itoh, M.

AU - Matoba, Masanori

AU - Kamihara, Yoichi

PY - 2015/5/7

Y1 - 2015/5/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84927132718&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84927132718&partnerID=8YFLogxK

U2 - 10.1063/1.4916808

DO - 10.1063/1.4916808

M3 - Article

VL - 117

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 17

M1 - 17E123

ER -