相分离体系Nd_(1-x)Sr_xCoO_3的亚铁磁行为

Ferrimagnetic behavior of phase-separated polycrystalline perovskite Nd_(1-x)Sr_xCoO_3

研究了Nd1-xSrxCoO3(0.1≤x≤0.5)系列多晶样品在低温时的亚铁磁行为.通过传统的固相反应法合成了Nd1-xSrxCoO3多晶样品,应用物理性质测试系统对样品进行了直流磁化强度、磁滞回线的测试.磁化强度的研究表明,随掺杂量增加,团簇的数目和尺寸都在增加,铁磁性增强.同时,多晶样品在低温时形成亚铁磁序.磁滞回线的研究表明,Nd离子与Co离子之间存在磁性耦合.由于Co与Nd的反平行排列,Nd1-xSrxCoO3体系低温时出现亚铁磁序.

The ferrimagnetic behavior of polycrystalline Nd1-xSrxCoO3 （0.1≤x≤0.5 ） sample is systematically investigated. The sample is prepared by using conventional solid state reaction method. The DC magnetization and the hysteresis loops of polycrystalline Nd1-xSrxCoO3 are carried out by using the physical properties measurement system of quantum design. DC magnetization studies show that magnetization increases in magnitude as a result of increasing size and number of ferromagnetic clusters, which shows ferromagnetic ordering. Moreover, DC magneti- zation studies show that polycrystalline samples form the formation of ferrimagnetic order at low temperature. The re- sult of the hysteresis loop suggests that magnetic coupling exists between Nd ions and Co ions. Therefore, Nd1-xSrxCoO3 ferrimagnetic order appears at low temperature due to the Co and Nd anti-parallel.