Spin Glass State in Chemical Vapor-Deposited Crystalline Cr2Se3 Nanosheets
Spin Glass State in Chemical Vapor-Deposited Crystalline Cr2Se3 Nanosheets
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DOI：
10.1021/acs.chemmater.1c01222
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发表时间：
2021-05
影响因子：
8.6
通讯作者：
Xukun Zhu;Hang Liu;Liang Liu;L. Ren;Wan-min Li;Leiming Fang;Xiping Chen;Lei Xie;Y. Jing
中科院分区：
文献类型：
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作者：
Xukun Zhu;Hang Liu;Liang Liu;L. Ren;Wan-min Li;Leiming Fang;Xiping Chen;Lei Xie;Y. Jing
二维(2D)磁体因其稳定的长程磁序和2D极限下的反常磁物理而引起了人们的极大关注。自旋玻璃态通常在具有自旋受挫的无序系统中被发现，这在2D晶体材料中是很少见的。在这里，化学气相沉积的菱面体Cr2Se3纳米片可以生长到1.9 nm的厚度，表现出1.5kOe的大矫直力和热不可逆性。通过交流磁化率测量可以估算出冻结温度为28K的自旋玻璃态，其中明确的磁响应证据表明晶态的Cr2Se3纳米片中存在自旋玻璃态。抽出的10-13s的短弛豫时间和中子衍射证实的原子磁阻可以有力地表明Cr2Se3纳米片中具有原子短程磁序的自旋玻璃态。
Two-dimensional (2D) magnets have raised enormous attention because of their stable long-range magnetic orders and anomalous magnetic physics at 2D limits. Spin glass states are normally discovered in disordered systems with spin frustration, which are rarely found in 2D crystalline materials. Here, the chemical vapor-deposited rhombohedral Cr2Se3nanosheets could be grown down to a thickness of 1.9 nm, which have shown a hard magnetism of large coercivity of 1.5 kOe and exhibited thermal irreversibility. A spin glass state with a freezing temperature of 28 K can be estimated from an alternating-current magnetic susceptibility survey, in which unambiguous magnetic response evidence of a spin glass state in crystalline Cr2Se3nanosheets was shown. An extracted short relaxation time of 10–13s and atomic magnetic frustration that were confirmed by neutron diffraction could strongly suggest the spin glass state with an atomically short-range magnetic order in the Cr2Se3nanosheets.