通过固相反应法制备了多晶样品NdSr2Mn2O7,利用XRD和SQUID研究了样品的结构和磁性.结果表明,该样品的单相性很好,单相结构为Sr2Ti2O7四角型结构(14/mmm).磁性测量表明,温度高于居里温度(Tc=275K)时,样品呈现顺磁性,随着温度的降低,发生顺磁一铁磁的转变.当温度降到150K时.零场冷却出现了一个峰值,表明样品具有自旋玻璃行为.自旋玻璃行为主要是团簇间的相互作用和自旋玻璃相共同作用的结果.
Polycrystalline sample of NdSr2Mn2O7 was prepared by conventional solid state reaction method. The structure and magnetic properties of the compound have been studied by using X-ray diffraction and magnetization measurements. The results indicate that the compound crystallizes in a pervoskite structure of Sr3Ti2O7-type tetragonal structure (14/mmm). When the temperature is higher than Curie temperature (Tc =265 K), the compound presents paramagnetic behavior. With the decrease of temperature, Ndl.2Srl.8Mn2O7 undergoes a transformation from paramagnetism to ferromagnetism.