Two-dimensional magnetic order in Pb2sr2tbcu 3o8

S. Y. Wu, W. T. Hsieh, W. H. Li, K. C. Lee, J. W. Lynn, H. D. Yang

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23 Scopus citations

Abstract

Neutron diffraction techniques have been used to investigate the magnetic ordering of the Tb ions in polycrystalline Pb2Sr2TbCu 3O8. Significant magnetic correlations are found to develop below ∼10 K, and these correlations are two dimensional in nature, representative of the strongly anisotropic magnetic interactions in these layered materials. The correlation length increases with decreasing temperature, and long-range order is observed to develop at TN≊5.5 K. However, the sawtooth Bragg profile for the scattering demonstrates that the long-range order is two dimensional, rather than three dimensional, with a spin configuration where nearest-neighbor spins are antiparallel. The scattering profile can be explained quantitatively by assuming long-range order within the ab plane, with no significant correlations along the c axis to the lowest temperatures measured (1.36 K). Our results suggest that the system is well described by a two-dimensional Ising model. The only other (pure) system where a crossover to three-dimensional behavior is not observed is DyBa 2Cu4O8.

Original languageEnglish
Pages (from-to)6598-6600
Number of pages3
JournalJournal of Applied Physics
Volume75
Issue number10
DOIs
StatePublished - 1994

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