离子掺杂调控CuCrO2体系磁序的理论模拟研究

来源 :第十九届全国凝聚态理论与统计物理学术会议 | 被引量 : 0次 | 上传用户:jeremy008
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  基于经典的三角失措自旋模型,本文用蒙特卡罗模拟研究了晶格缺陷与铁磁掺杂对于多铁体系CuCrO2的磁相变行为的影响,研究表明:在缺陷掺杂与铁磁掺杂下,该体系的非公度反铁磁螺旋序被破坏,取而代之的是低温冻结自旋玻璃态;模拟得到的反铁磁-顺磁相变温度和自旋玻璃冻结温度与掺杂浓度之间的关系与实验报道较好吻合。另一方面,我们的工作还表明掺杂引起的巡游空穴导致了量子涨落效应的增强,从而增强了等效的双二次交换作用,进一步稳定了反铁磁序,定性的解释了Mg掺杂增强反铁磁序的实验报道。
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