Abstract
Measurements of the anomalous behavior in the linear thermal expansion coefficient near the antiferromagnetic phase transitions in K2ReCl6 and K2IrCl6 are reported. The results for the two compounds, which have the same crystal structure but different magnetic structures, clearly demonstrate that the contribution of the next-nearest-neighbor exchange interaction to the thermal strain is of opposite sign for the two compounds. In agreement with sublattice magnetization measurements, a spin contribution is found to persist to within10% of the Néel temperature in K2ReCl6. The relevance of the results to this unusual magnetic behavior is discussed in terms of the important role played by the next-nearest-neighbor superexchange.
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Research supported in part by the National Research Council of Canada.
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Willemsen, H.W., Armstrong, R.L. & Meincke, P.P.M. Thermal expansion measurements near the antiferromagnetic phase transitions in K2ReCl6 and K2IrCl6 . J Low Temp Phys 26, 299–309 (1977). https://doi.org/10.1007/BF00654574
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DOI: https://doi.org/10.1007/BF00654574