摘要
The temperature evolution of the crystal structure for Nd_(0.5)Sr_(0.5)MnO_3 has been investigated by powder XRD between 125 Kand 725K.The structure can be described with a monoclinic symmetry(space group P21/m)in the temperature range of 125—175 K,while with the increase in temperature between 175 Kand 575 Kthe structure involves a higher orthorhombic symmetry(space group Imma).The rhombohedral structure with space group R-3cis observed at high temperature region of 575—725K.The increase in the magnetization at low temperatures can be ascribed to the field-induced short-range magnetic order of the Nd3+ions.The dc and ac susceptibility data show some anomalies around the FM-PM transition region which can be attributed to the glass behavior and magnetic relaxation.
The temperature evolution of the crystal structure for Nd0.7Sr0.3MnO3 has been investigated by powder XRD between 125 K and 725 K, The structure can be described with a monoclinic symmetry （space group P21/m） in the temperature range of 125-175 K, while with the increase in temperature between 175 K and 575 K the structure involves a.higher orthorhombic symmetry （space group Imma）. The rhombohedral structure with space group R-3c is observed at high temperature region of 575--725 K. The increase in the magnetization at low tern peratures can be ascribed to the field-induced short-range magnetic order of the Nda＋ ions. The dc and ac suscepti bility data show some anomalies around the FM-PM transition region which can be attributed to the glass behavior and magnetic relaxation.
基金
supported by the Jiangsu Provincial Natural Science Foundation(No.BK20141411)
