Adiabatic demagnetization of a pyrochlore antiferromagnet Gd2Ti2O7

被引：4
|
作者：
Sosin, SS
Prozorova, LA
Smirnov, AI
Golov, AI
Berkutov, IB
Petrenko, OA
Balakrishnan, G
Zhitomirsky, ME
机构：
[1] RAS, PL Kapitza Phys Problems Inst, Moscow 119334, Russia
[2] Univ Manchester, Dept Phys & Astron, Manchester M13 9PL, Lancs, England
[3] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
[4] SPSMS, DRFMC, DSM, Comissariat Energie Atom, Grenoble 9, France
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2005年 / 290卷
关键词：
magnetocaloric effect; frustration; rare-earth compounds;
D O I：
10.1016/j.jmmm.2004.11.344
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An adiabatic demagnetization process is studied in the pyrochlore antiferromagnet Gd2Ti2O7. A strong cooling of the sample is observed by decreasing magnetic field in the range 120-60 kOe corresponding to a crossover between saturated and spin-liquid phases. This phenomenon indicates that a considerable part of the magnetic entropy associated with a macroscopic number of local soft modes survives in the strongly correlated paramagnetic state. Monte Carlo simulations demonstrate good agreement with the experiment. The cooling power of the process is experimentally estimated with a view to possible technical applications. The results on Gd2Ti2O7 are compared to those for Gd3Ga5O12, a related material for low-temperature magnetic cooling. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：709 / 711
页数：3
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