通过中子粉末衍射确定正铁酸盐CeFeO中的磁结构：一阶自旋重取向和有序Ce磁矩的出现

Determination of the magnetic structures in orthoferrite CeFeOby neutron powder diffraction: first order spin reorientation and appearance of an ordered Ce-moment.

作者信息

Ritter Clemens, Ceretti Monica, Paulus Werner

机构信息

Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France.

ICGM, University of Montpellier, CNRS, ENSCM, Montpellier, France.

出版信息

J Phys Condens Matter. 2021 Apr 29;33(21). doi: 10.1088/1361-648X/abe64a.

DOI:10.1088/1361-648X/abe64a

PMID:33588404

Abstract

High resolution and high intensity neutron powder diffraction are used to determine the temperature dependence of the crystallographic and magnetic structure of the orthoferrite CeFeO. The high temperature-type magnetic coupling of the Fe-sublattice described by the Γ() irreducible representation changes at the spin reorientation temperature= 228 K to a-type coupling of Γ(). The spin reorientation is of first order and sees a hysteresis of about 2.5 K at. Below 35 K faint magnetic peaks reflectingtype magnetic coupling appear and are argued to be related to the Ce-sublattice. Magnetic moments at 2 K amount to= 4.15 and= 0.11 . CeFeOis only the secondFeOcompound after DyFeOshowing this ground state magnetic structure of the Fe-sublattice. The orthorhombic structureis kept over the whole temperature range.

摘要

利用高分辨率和高强度中子粉末衍射来确定正铁酸盐CeFeO的晶体结构和磁结构的温度依赖性。由Γ()不可约表示描述的Fe亚晶格的高温型磁耦合在自旋重取向温度 = 228 K时转变为Γ()的a型耦合。自旋重取向是一级的，在该温度下出现约2.5 K的磁滞。在35 K以下，出现反映型磁耦合的微弱磁峰，据认为这与Ce亚晶格有关。2 K时的磁矩分别为 = 4.15 和 = 0.11 。CeFeO是继DyFeO之后第二个具有这种Fe亚晶格基态磁结构的FeO化合物。正交结构在整个温度范围内保持不变。