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  • Title: Coexistence of long-range cycloidal order and spin-cluster glass state in the multiferroic BaYFeO4.
    Author: Ghara S, Sundaresan A.
    Journal: J Phys Condens Matter; 2018 Jun 20; 30(24):245802. PubMed ID: 29726840.
    Abstract:
    We report the presence of spin glass state below the cycloidal spin ordering in the multiferroic BaYFeO4. This compound is known to crystallize in an orthorhombic structure with a centrosymmetric space group Pnma and exhibits two successive antiferromagnetic phase transitions. Upon cooling, it undergoes a spin density wave (SDW)-like antiferromagnetic ordering at T N1 ~ 48 K and a cycloidal ordering at T N2 ~ 35 K. Using dc magnetic memory effect and magnetization relaxation studies, we have shown that this oxide undergoes a reentrant spin glass transition below T * ~ 17 K. Our analysis suggests the presence of spin clusters in the glassy state. The coexistence of spin-cluster glass and long-range cycloidal ordered states results in an exchange bias effect at 2 K. The origin of the glassy state has been attributed to freezing of some Fe3+ moments, which do not participate in the long-range ordering.
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