研究了多晶样品Nd_(0.5)Sr_(0.5-x)Ca_xMnO_3(x=0.1,0.2)的磁性.实验结果表明,样品的单相性好,无杂相,空间群为Pbnm.随着温度的降低,样品先后经历了3次磁性转变,分别为顺磁-铁磁转变TC、电荷有序转变TCO和奈尔温度转变TN;在TC以上,系统处于顺磁态,在TC-TCO范围内,系统处于铁磁-顺磁共存态,在TCO-TN范围内,系统处于反铁磁-铁磁-顺磁共存态,在TN以下,系统主要处于反铁磁态.
The magnetic property of Polyerystalline sample Nd_(0.5)Sr_(0.5-x)Ca_xMnO_3(x=0.1,0.2) was studied. The experiment result indicates that the sample is in single phase with the space group Pbnm symmetry. With the decrease of temperature, the sample underwent three magnetic transitions: ferromag- netic transition Tc ,charge-ordering transition Tco, and an antiferromagnetic transition T_N. Above Tc, the sample is paramagnetic, between Tc and Tco, paramagnetic-ferromagnetic coexistence, between Tco and T_N paramagnetic-ferromagnetic-antiferromagntic coexistence, below T_N, the system appears to be antiferro- magnetic.