Magnetocaloric effect in pyrochlore antiferromagnet Gd2Ti2O7

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dc.creatorSosin, S. S.
dc.creatorProzorova, L. A.
dc.creatorSmirnov, A. I.
dc.creatorGolov, A. I.
dc.creatorBerkutov, I. B.
dc.creatorPetrenko, O. A.
dc.creatorBalakrishnan, G.
dc.creatorZhitomirsky, M. E.
dc.date2004-04-22
dc.date2004-12-17
dc.date.accessioned2026-07-07T02:57:45Z
dc.date.available2026-07-07T02:57:45Z
dc.descriptionAn adiabatic demagnetization process is studied in Gd2Ti2O7, a geometrically frustrated antiferromagnet on a pyrochlore lattice. In contrast to conventional paramagnetic salts, this compound can exhibit a temperature decrease by a factor of ten in the temperature range below the Curie-Weiss constant. The most efficient cooling is observed in the field interval between 120 and 60 kOe corresponding to a crossover between saturated and spin-liquid phases. This phenomenon indicates that a considerable part of the magnetic entropy survives in the strongly correlated state. According to the theoretical model, this entropy is associated with a macroscopic number of local modes remaining gapless till the saturation field. Monte Carlo simulations on a classical spin model demonstrate good agreement with the experiment. The cooling power of the process is experimentally estimated with a view to possible technical applications. The results for Gd2Ti2O7 are compared to those for Gd3Ga5O12, a well-known material for low temperature magnetic refrigeration.
dc.description6 pages, 4 figures, accepted version
dc.identifierhttps://arxiv.org/abs/cond-mat/0404529
dc.identifierhttp://arxiv.org/abs/cond-mat/0404529
dc.identifierPhys. Rev. B 71, 094413 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.094413
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23797
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleMagnetocaloric effect in pyrochlore antiferromagnet Gd2Ti2O7
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