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Why is the electrocaloric effect so small in ferroelectrics?
Electrocaloric Materials: New Generation of Coolers, edited by T. Correia and Q. Zhang (Springer-Verlag, Berlin, 2014).
M. E. Lines and A. M. Glass, Principles and Applications of Ferroelectrics and Related Materials (Clarendon Press, Oxford, 1977).
M. Valant, L. J. Dunne, A.-K. Axelsson, N. McN. Alford, G. Manos, J. Peräntie, J. Hagberg, H. Jantunen, and A. Dabkowski, Phys. Rev. B 81, 214110 (2010).
F. Le Goupil, A.-K. Axelsson, L. J. Dunne, M. Valant, G. Manos, T. Lukasiewicz, J. Dec, A. Berenov, and N. McN. Alford, Adv. Energy Mater. 4, 1301688 (2014).
B. A. Strukov, Sov. Phys.-Crystallogr. 11, 757 (1967).
B. A. Strukov and A. P. Levanyuk, Ferroelectric Phenomena in Crystals (Springer, Berlin, 1998).
Landolt-Börnstein: Numerical Data and Functional Relationships in Science and Technology–Ferroelectrics and Related Substances, edited by K.-H. Hellwege and A. M. Hellwege (Springer-Verlag, Berlin, 1981), Vol. 16.
W. Cochran, Phys. Rev. Lett. 3, 412 (1959);
P. W. Anderson, in Fizika Dielectrikov, edited by G. I. Skanavi (Akad. Nauk SSSR Fizicheskii Inst., im P. N. Levedeva, Moscow, 1960).
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Ferroelectrics are attractive candidate materials for environmentally friendly solid state refrigeration free of greenhouse gases. Their thermal response upon variations of external electric fields is largest in the vicinity of their phase transitions, which may occur near room temperature. The magnitude of the effect, however, is too small for useful cooling applications even when they are driven close to dielectric breakdown. Insight from microscopic theory is therefore needed to characterize materials and provide guiding principles to search for new ones with enhanced electrocaloric performance. Here, we derive from well-known microscopic models of ferroelectricity meaningful figures of merit for a wide class of ferroelectric materials. Such figures of merit provide insight into the relation between the strength of the effect and the characteristic interactions of ferroelectrics such as dipolar forces. We find that the long range nature of these interactions results in a small effect. A strategy is proposed to make it larger by shortening the correlation lengths of fluctuations of polarization. In addition, we bring into question other widely used but empirical figures of merit and facilitate understanding of the recently observed secondary broad peak in the electrocalorics of relaxor ferroelectrics.
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