Abstract
The critical exponents β, γ and δ of undeuterated and partially deuterated ferroelectric betaine arsenate are estimated. Small but remarkable deviations from the tricritical values are observed. The obtained values are tested via scaling of the isothermals.
At some distance aboveT c a cross-over of the effective critical exponent γ to a value typically for short-range forces is observed. A suitably defined cross-over temperature range decreases with increasing deuteration and seems to vanish near the antiferroelectric phase boundary.
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Schell, U., Müser, H.E. Critical behavior of betaine arsenate. Z. Physik B - Condensed Matter 66, 237–241 (1987). https://doi.org/10.1007/BF01311660
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DOI: https://doi.org/10.1007/BF01311660