论文标题
强相关的Eumum2p2中的磁相跨界
Magnetic phase crossover in strongly correlated EuMn2P2
论文作者
论文摘要
强的电子相关性是大量电子和磁性组件和设备的基础，通常用于识别和探测量子材料中的新基态。本文中，我们报告了Eumn2P2中的磁相跨界，这是一种绝缘子，该绝缘子在TN = 17K时显示了欧盟抗铁磁性，但没有归因于Mn磁性的相变。缺乏Mn磁相变向对比与在等电机Eumn2SB2和Eumn2AS2中T = 130K的远程MN顺序形成。与温度依赖的特异性热和31p NMR测量值为从T = 250-100 K的MN磁相关开发提供了证据。密度功能理论计算表明，带有抗超磁性MN序列的型MN和EU磁序的细节，带有抗磁性MN顺序，抗源性MN序列的细节具有异常的敏感性。我们的结果暗示着一张图片，其中远距离MN磁性被化学压抑制了，但磁相关性持续存在，缩小带和产生绝缘状态。
Strong electron correlations underlie a plethora of electronic and magnetic components and devices and are often used to identify and probe novel ground states in quantum materials. Herein we report a magnetic phase crossover in EuMn2P2, an insulator which shows Eu antiferromagnetism at TN=17K, but no phase transition attributed to Mn magnetism. The absence of a Mn magnetic phase transition contrasts with the formation of long-range Mn order at T=130K in isoelectronic EuMn2Sb2 and EuMn2As2. Temperature-dependent specific heat and 31P NMR measurements provide evidence for the development of Mn magnetic correlations from T=250-100 K. Density functional theory calculations demonstrate an unusual sensitivity of the band structure to the details of the imposed Mn and Eu magnetic order, with antiferromagnetic Mn order required to recapitulate an insulating state. Our results imply a picture in which long range Mn magnetic order is suppressed by chemical pressure, but that magnetic correlations persist, narrowing bands and producing an insulating state.
