摘要
The magnetic and electric properties of polycrystalline(La_(0.7)Tb_(0.3))_(2/3)Ca_(l/3)MnO_(3)were investigated.A spin glass-paramagnetic transition and metal-insulator transition were observed near 45K,and there exists continuous volume change in the range of measured temperature.At 60 K,a large anisotropic magnetostriction and a volume magnetostriction correspond to an isotropic colossal magnetoresistance(CMR)with the magnitude of more than 40%at an applied field of±0.1 T.Our results demonstrate that the transition is of second-order in nature and CMR could be caused by spin-charge coupling in this compound.
基金
the China Post-doctoral Science Foundation,and the National Natural Science Foundation of China under Grant No.59392800-2.
