Repositorio de producción científica de la Universidad de Sevilla

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

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

Citas
Exportar a
 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... [Ver más] 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

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

Esta obra está bajo una Licencia Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internacional