RUI: Magnetic Phase Transitions in Novel Pure, Dilute and Mixed Magnetic Insulators

本研究的目的是探索新型纯磁、稀磁和混合磁绝缘子的磁相变。对绝热材料中的自旋玻璃行为进行了研究。此外，还研究了几种可能出现自旋玻璃相的混合磁系统。在其他混合磁系统中，研究了磁相图中的四临界点或其他多临界点。作为稀磁模型类的一个例子，还研究了稀磁系统。对单晶和多晶样品进行了变温、变场磁化和磁化率测量。这些研究很重要，因为它们提供了有关零场分裂、铁磁相互作用和自旋类别特征等领域的信息。

The objectives of this research are to explore magnetic phase transitions in novel pure, dilute and mixed magnetic insulators. The study of spin glass behavior in insulating materials are conducted. Also, several mixed magnetic systems are studied in which spin glass phases might occur. In other mixed magnetic systems tetracritical or other multicritical points in the magnetic phase diagram are investigated. As an example of a rare magnetic model class, a dilute magnetic system is studied as well. Variable temperature, variable field magnetization and susceptibility measurements are conducted on single crystal and polycrystalline samples. These studies are important because they provide information on areas such as zero-field splittings, ferromagnetic interactions, and spin class character.