摘要
A large magnetic entropy change about twice as high as that of pure gadolinium metal near room temperature has been discovered in manganese perovskites La_(0.837)Ca_(0.098)Na_(0.038)Mn_(0.987)O_(3.00)(8.3 J·kg^(-1)·K^(-1),at 256K)and La_(0.822)Ca_(0.096)K_(0.043)Mn_(0.974)O_(3.00)(6.8 J·kg^(-1)·K^(-1),at 265 K)under a magnetic field of 1.5 T.This phenomenon indicates that manganese perovskites have potential applications for magnetic refrigerants in an extended temperature range even near room temperature.
作者
ZHONG Wei
CHEN Wei
WANG Jin-Hui
DU You-Wei
钟伟;陈伟;王锦辉;都有为(National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093;Department of Physics,Hebei Normal University,Shijiazhuang 050091)
基金
Supported by the National Natural Science Foundation of China under Grant No.50072007
the National Kay Project for Basic Research(No.G1999064508)
the National Kay Project for Science and Technology(No.99-A30-01-03).
