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Reentrant Spin Glass and Large Coercive Field Observed in a Spin Integer Dimerized Honeycomb Lattice

机译：在旋转整数二聚蜂窝格子中观察到旋流旋转玻璃和大矫顽磁场

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摘要

2D magnetic materials with dimerized honeycomb lattices can be treated as mixed-spin square lattices, in which a quantum phase transition may occur to realize the Bose-Einstein condensation of magnons under reachable experimental conditions. However, this has never been successfully realized with integer spin centers. Herein, a spin integer (S= 2) dimerized honeycomb lattice in an iron(II)-azido compound [Fe(4-etpy)(2)(N-3)(2)](n)(FEN, 4-etpy = 4-ethylpyridine) is realized. Morphology characterization by transmission electron microscopy, scanning electron microscopy, and atomic force microscopy spectroscopies show that the thinnest place of the sample is approximate to 13 nm, which is equal to ten layers of the compound. In contrast to the common magnetic properties of long-range magnetic ordering, Mossbauer and polarized neutron scattering studies reveal that FEN exhibits a reentrant spin glass behavior owing to competing ferro- and antiferromagnetic exchange-coupling interactions within the lattice. Two spin glass phases with disparate canting angles are characterized at 39 and 28 K, respectively. By using Curely's model, two exchange-coupling constants (J(1)= +35.8 cm(-1)andJ(2)= -3.7 cm(-1)) can be simulated. Moreover, a very large coercive field of approximate to 1.9 Tesla is observed at 2 K, making FEN a "very hard" van der Waals 2D magnetic material.
机译：具有二聚蜂窝状晶格的2D磁性材料可作为混合旋转方格处理，其中可能发生量子相转变以实现可达实验条件下造成的千吨的沸腾凝聚。但是，这从未用整数旋转中心成功实现。在本文中，在铁（II）中的旋转整数（S = 2）二种蜂窝晶格 - ZiDO化合物[Fe（4-Etpy）（2）（N-3）（2）]（N）（Fen，4-Etpy实现了4-乙基吡啶）。通过透射电子显微镜，扫描电子显微镜和原子力显微镜谱的形态学表明，样品的最薄位置近似为13nm，其等于化合物的十层。与远程磁性排序的常见磁性相比，莫斯堡和偏振中子散射研究表明，由于竞争格子和晶格内的反铁磁交换偶联相互作用，FEN表现出旋转旋转玻璃行为。具有不同分散角的两个自旋玻璃相分别以39和28k为特征。通过使用CIDLY的模型，可以模拟两个交换耦合常数（J（1）= +35.8cm（-1）和j（2）= -3.7cm（-1））。此外，在2 k下观察到近似为1.9特斯拉的非常大的矫顽基，使得FEN为“非常硬”范德瓦尔斯2D磁性材料。

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  • 来源
    《Advanced Functional Materials》 |2021年第1期|2004744.1-2004744.10|共10页
  • 作者

    Zhai Yuan-Qi; Deng Yi-Fei; Fu Zhendong; Feng Erxi; Su Yixi; Shiga Takuya; Oshio Hiroki; Zheng Yan-Zhen;

  • 作者单位

    Xi An Jiao Tong Univ MOE Key Lab Nonequilibrium Synth Condensed Matter State Key Lab Mech Behav Mat Shenzhen Res Sch Frontier Inst Sci & Technol FIST 99 Yanxiang Rd Xian 710054 Shaanxi Peoples R China;

    Xi An Jiao Tong Univ MOE Key Lab Nonequilibrium Synth Condensed Matter State Key Lab Mech Behav Mat Shenzhen Res Sch Frontier Inst Sci & Technol FIST 99 Yanxiang Rd Xian 710054 Shaanxi Peoples R China;

    Songshan Lake Mat Lab Neutron Platform Dongguan 523808 Peoples R China;

    Forschungszentrum Julich Julich Ctr Neutron Sci JCNS Heinz Maier Leibnitz Zentrum MLZ Lichtenbergstr 1 D-85747 Garching Germany;

    Forschungszentrum Julich Julich Ctr Neutron Sci JCNS Heinz Maier Leibnitz Zentrum MLZ Lichtenbergstr 1 D-85747 Garching Germany;

    Univ Tsukuba Grad Sch Pure & Appl Sci Tennodai 1-1-1 Tsukuba Ibaraki 3058571 Japan;

    Univ Tsukuba Grad Sch Pure & Appl Sci Tennodai 1-1-1 Tsukuba Ibaraki 3058571 Japan|Dalian Univ Technol State Key Lab Fine Chem 2 Linggong Rd Dalian 116024 Peoples R China;

    Xi An Jiao Tong Univ MOE Key Lab Nonequilibrium Synth Condensed Matter State Key Lab Mech Behav Mat Shenzhen Res Sch Frontier Inst Sci & Technol FIST 99 Yanxiang Rd Xian 710054 Shaanxi Peoples R China;

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  • 关键词

    2D frustrated magnets; dimerized honeycomb lattices; iron(II); neutron scattering; spin glass;

    机译：2D令人沮丧的磁铁;二聚体蜂窝格子;铁（ii）;中子散射;旋转玻璃;

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