Zhou Xueli, Xu Haihong, Zhang Jiang, Tang Lingyun, Chen Xi, Mao Zhongquan
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, People's Republic of China.
J Phys Condens Matter. 2024 Feb 21;36(20). doi: 10.1088/1361-648X/ad24bd.
Van der Waals (vdW) gap is a significant feature that distinguishes vdW magnets from traditional magnets. Manipulating the magnetic properties by changing the vdW gap has been hot topic in condensed matter research. Here we report a re-emerging magnetic order induced by pressure in a correlated vdW antiferromagnetic insulator NiPS. It is found that the interlayer magnetoresistance (MR) nearly vanishes at the critical pressure where the crystal structure transforms from2/phase to the sliding2/phase. On further compression within the sliding2/phase, a substantially enhanced MR emerges from low temperature associated with an insulator-to-metal transition, indicating a metallic antiferromagnetic phase. The enhanced re-emerging MR in sliding2/phase can be ascribed to the increasing magnetic interaction between neighboring layers due to the vdW gap narrowing. Our results provide important experimental clues for understanding the pressure effects on magnetism in correlated layered materials.
范德华（vdW）能隙是区分范德华磁体与传统磁体的一个重要特征。通过改变范德华能隙来调控磁性能一直是凝聚态物质研究中的热点话题。在此，我们报道了在一种关联范德华反铁磁绝缘体NiPS中由压力诱导出的一种重新出现的磁有序。研究发现，在晶体结构从2/相转变为滑动2/相的临界压力下，层间磁电阻（MR）几乎消失。在滑动2/相内进一步压缩时，从低温出现了与绝缘体 - 金属转变相关的显著增强的磁电阻，表明存在金属反铁磁相。滑动2/相中增强的重新出现的磁电阻可归因于由于范德华能隙变窄导致相邻层之间磁相互作用的增加。我们的结果为理解压力对关联层状材料中磁性的影响提供了重要的实验线索。
