Magnetic behavior of the two-dimensional antiferromagnet RbFeF 4

Abstract

RbFeF 4 shows anomalous magnetic susceptibility behavior rather similar to that of KFeF 4, in which the existence of two-dimensional antiferromagnetic ordering has recently been clearly demonstrated. A neutron diffraction study of powder samples reveals that RbFeF 4 orders antiferromagnetically in three dimensions at T N = 134 K. In addition around T N , the diffraction patterns indicate a magnetic ridge, thus giving, in accordance with KFeF 4, the evidence of the two-dimensional nature of the magnetism in RbFeF 4.