Europhys. Lett, 48 (6), pp. 667-671 (1999)
The Curie-Weiss behavior of heat capacity and dielectric constant in the incommensurate phase of
H. Y. Ahn 1,2, S. Y. Jeong 1,2, Y. H. Jeong 3, Y. C. Cho 1 and Y. H. Hwang 1
1Research Center for Dielectric and Advanced Matter Physics
Pusan National University - Pusan, 609-735, Korea
2Department of Physics, Pusan National University - Pusan, 609-735, Korea
3Department of Physics, Pohang University of Science and Technology
Pohang, 709-784, Korea
(received 3 March 1999; accepted in final form 20 October 1999)
PACS. 64.70Rh - Commensurate-incommensurate transitions.
PACS. 65.40+g - Heat capacities of solids.
The Curie-Weiss behavior of heat capacity and dielectric constant was observed in the incommensurate phase of , as temperature is lowered toward the incommensurate-commensurate phase transition. The exponents obtained from the dielectric and heat capacity measurements were and , respectively. The present results support the view on the evolution of the incommensurate phase that the incommensurate phase consists of regularly placed discommensurations, and the distance between discommensurations increases and eventually a transition to the commensurate phase occurs as temperature is lowered.
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