Gd5Ge4的磁结构相变和磁玻璃行为的研究  

Magnetic structural phase transition and magnetic glass state in magnetocaloric material Gd5Ge4

作　　者：董彤[1] 袁淑娟[1] 徐坤[1] 郁黎明[1] 曹世勋[1] 张金仓[1] 

机构地区：[1]上海大学物理系,上海200444

出　　处：《功能材料》2007年第A03期1150-1152,共3页Journal of Functional Materials

摘　　要：通过对温度诱导和磁场诱导的磁化强度的测量和分析，证明了Gd5Ge4在低温范围存在从反铁磁到铁磁的一级结构相变，有典型的相分离特征。为了进一步说明Gd5Ge4的磁结构相变，对不同低温的磁场诱导的磁化强度进行了两次循环测量，结果显示Gd5Ge4在低温下磁化行为具有不可逆性和对温度的依赖性。同时对磁化强度的研究揭示了Gd5Ge4在低温时存在磁玻璃态。Temperature and magnetic field dependent magnetization of polycrystalline have been measured, we demonstrate the first order transition and the existence of phase separation in within the low temperature region. In addition to uncovering the magnetic structural transformation, our date demonstrate the irreversible magnetic transition and temperature dependent of these magnetic transition. A magnetization study clearly reveals magnetic glasslike dynamics in the low-temperature antiferromagnetically ordered state.

关 键 词：一级磁结构相变 相分离 不可逆性 磁玻璃态 

分 类 号：TB64[一般工业技术—制冷工程]