UNSPECIFIED (2005) Magnetocaloric effect in pyrochlore antiferromagnet Gd2Ti2O7. PHYSICAL REVIEW B, 71 (9). -. doi:10.1103/PhysRevB.71.094413 ISSN 1098-0121.

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Abstract

An 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 10 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 until 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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	PHYSICAL REVIEW B
Publisher:	AMERICAN PHYSICAL SOC
ISSN:	1098-0121
Official Date:	March 2005
Dates:	Date Event March 2005 UNSPECIFIED
Volume:	71
Number:	9
Number of Pages:	5
Page Range:	-
DOI:	10.1103/PhysRevB.71.094413
Publication Status:	Published

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