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arXiv 2209.01707cond-mat.str-el
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强关联EuMn2P2中的磁相位交叉

Magnetic phase crossover in strongly correlated EuMn2P2

Tanya Berry, Nicodemos Varnava, Dominic Ryan, Veronica Stewart, Riho Rästa, Ivo Heinmaa, Nitesh Kumar, Walter Schnelle, Rishi Bhandia, Christopher Pasco, N. P. … 展开作者

Tanya Berry, Nicodemos Varnava, Dominic Ryan, Veronica Stewart, Riho Rästa, Ivo Heinmaa, Nitesh Kumar, Walter Schnelle, Rishi Bhandia, Christopher Pasco, N. P. Armitage, Raivo Stern, Claudia Felser, David Vanderbilt, Tyrel M. McQueen

摘要:

强电子相关性是大量电子和磁性元件和器件的基础,并且通常用于识别和探测量子材料中的新基态。本文报道了EuMn_2 P_2中的磁相变,该绝缘体在TN= 17 K时显示Eu反铁磁性,但没有归因于Mn磁性的相变。Mn磁性相变的情况下形成对比,在T= 130 K在等电子EuMn 2 Sb 2和EuMn 2 As 2的长程Mn秩序。变温比热和~(31)P NMR测量结果为Mn磁性关联的发展提供了证据。密度泛函理论的计算表明,一个不寻常的灵敏度的能带结构的细节所施加的Mn和Eu的磁秩序,与反铁磁Mn秩序需要概括的绝缘状态。我们的研究结果意味着一个图片中,长程锰磁序被抑制的化学压力,但磁相关性持续存在,窄频带和产生绝缘状态。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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