Two-dimensional critical behaviour in antiferrodistortive Al ur6(CIO4)3 and Ga ur6(ClO4)3 |
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| Authors: | J.H.M. Mooy |
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| Affiliation: | Laboratorium voor Fysische Chemie, Universiteit van Amsterdam, Nieuwe Achtergracht 127, 1018WS Amsterdam, The Netherlands |
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| Abstract: | Critical behaviour with dimensionality d = 2 has been observed for the 300 K antiferrodistortive phase transition in Al ur6(ClO4)3 and Ga ur6(ClO4)3 by means of the temperature dependence of the ESR parameter D. The systems exhibited d = 2 behaviour in the static critical behaviour for T<Tc?40 K for T>Tc + 40 K. From the ESR data including line width measurements the local order parameter relaxation rate ω1 has been obtained for various temperatures above Tc, with a lowest value of ω1 = 150 MHz at Tc + 15 K |
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