Abstract.
The thermal decrease of the order parameter can empirically be described by a single Tε power law with an exponent ε which depends on the dimensionality of the magnetic interactions and on whether the spin quantum number is integral or half-integral. We present experimental examples in which the order parameter shows a crossover between different Tε power laws as a function of temperature. This indicates that the magnetic interactions can change their dimensionality as a function of temperature.
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Received: 12 July 2001 / Accepted: 13 December 2001
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Köbler, U., Hoser, A., Fischer, K. et al. The impact of fourth-order exchange interactions on the thermal variation of the order parameter . Appl Phys A 74 (Suppl 1), s604–s606 (2002). https://doi.org/10.1007/s003390201858
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DOI: https://doi.org/10.1007/s003390201858