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The order parameter–entropy relation in some universal classes: experimental evidence

Opened Access The order parameter–entropy relation in some universal classes: experimental evidence

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Autor: Martín Olalla, José María
Romero Landa, Francisco Javier
Ramos Vicente, Saturio
Gallardo Cruz, María del Carmen
Pérez Mato, J.M.
Salje, E.K.H.
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 2003
Publicado en: Journal of Physics: Condensed Matter, 15 (14), 2423-2434.
Tipo de documento: Artículo
Resumen: The asymptotic behaviour near phase transitions can be suitably characterized by the scaling of $\Delta s/Q^2$ with $\epsilon=1-T/T_c$, where $\Delta s$ is the excess entropy and $Q$ is the order parameter. As $\Delta s$ is obtained by integration of the experimental excess specific heat of the transition $\Delta c$, it displays little experimental noise so that the curve $\log(\Delta s/Q^2)$ versus $\log\epsilon$ is better constrained than, say, $\log\Delta c$ versus $\log\epsilon$. The behaviour of $\Delta s/Q^2$ for different universality classes is presented and compared. In all cases, it clearly deviates from being a constant. The determination of this function can then be an effective method to distinguish asymptotic critical behaviour. For comparison, experimental data for three very different systems, Rb2CoF4, Rb2ZnCl4 and SrTiO3, are analysed under this approach. In SrTiO3, the function $\Delta s/Q^2$ does not deviate within experimental resolution from a straight line so tha...
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Cita: Martín Olalla, J.M., Romero Landa, F.J., Ramos Vicente, S., Gallardo Cruz, M.d.C., Pérez Mato, J.M. y Salje, E.K.H. (2003). The order parameter–entropy relation in some universal classes: experimental evidence. Journal of Physics: Condensed Matter, 15 (14), 2423-2434.
Tamaño: 190.5Kb
Formato: PDF

URI: http://hdl.handle.net/11441/64043

DOI: 10.1088/0953-8984/15/14/318

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