## Abstract

Neutron and X-ray diffraction studies were carried out on polycrystalline specimens of stoichiometric (S-) and non-stoichiometric (N-) YFe _{2}O_{4}. An asymmetric diffraction line was observed above the Neel point (T_{N}≃235 K) in S-YFe_{2}O_{4} and both above and below T_{N} (T_{N}≃210 K) in N-YFe _{2}O_{4}. At above T_{N}, the line profile was quantitatively interpreted as due to two-dimensional critical scattering, on an assumption that the scattering cross section is a Lorentzian in a h-k plane, independent of /. The correlation length, k, and the susceptibility at (1/3, 1/3, /), χ, obey an exponential law: k∝(T-T′_{n}) ^{v} and χ∝T-T′_{n})^{-y}, respectively, with v=1.5±0.05, γ=3.1±0.1 and T′_{N}=233.0= ′=0.5 K in S-YFe_{2}O_{4}. It was concluded that the spin correlation is two-dimensional in the hexagonal YFe_{2}O_{4}, both in the S- and N-compounds, but a crystal deformation induces a three-dimensional spin ordering in S-YFe_{2}O_{4}.

Original language | English |
---|---|

Pages (from-to) | 2688-2696 |

Number of pages | 9 |

Journal | journal of the physical society of japan |

Volume | 53 |

Issue number | 8 |

Publication status | Published - Aug 1984 |

Externally published | Yes |

## ASJC Scopus subject areas

- Physics and Astronomy(all)

## Fingerprint

Dive into the research topics of 'Two-dimensional spin correlation in YFe_{2}O

_{4}'. Together they form a unique fingerprint.