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目的:研究稀土化合物RVSb3家族中SmVSb3和LaVSb3的物理性质差异。方法:使用自助熔剂法生长SmVSb3和LaVSb3单晶样品，通过X射线衍射仪(X-ray diffractometer, XRD)和能量色散X射线谱(X-ray energy dispersive spectrum, EDS)表征其晶体结构与化学组分，再使用多功能物理性质测量系统(physical property measurement system, PPMS)测定样品的电输运性质，使用磁学性质测量系统(magnetic property measurement system, MPMS)测量样品的磁学性质。结果:XRD和EDS数据表明，实验成功合成了SmVSb3和LaVSb3单晶。磁性研究表明，SmVSb3单晶在奈尔温度TN=4.3 K表现出反铁磁性，并表现出显著的磁各向异性；但电输运方面却表现出微弱的各向异性。LaVSb3单晶表现出顺磁性，在电输运方面具有较为明显的各向异性。两种化合物都表现出明显的正磁阻效应，SmVSb3在6 K、7 T条件下，正磁阻(magnetoresistance, MR)约为36%;在200 K、7 T条件下，其MR仍保持约6%。LaVSb3在6 K、7 T条件下MR达到15.8%,且在实验可达到的最大磁场条件下没有观察到饱和现象。结论:尽管SmVSb3和LaVSb3为同构同家族化合物，却表现出截然不同的磁有序态和各向异性性质，揭示了稀土元素的替代对该类化合物磁性的调控作用。
Abstract：Aims: This paper aims to study the physical properties of SmVSb3 and LaVSb3 in the RVSb3 family of rare earth compounds. Methods: SmVSb3 and LaVSb3 single crystal samples were grown by the self-flux method. The structural components of the samples were characterized by XRD and EDS. The magnetic and electrical transport properties of the samples were measured by PPMS and MPMS. Results: XRD and EDS data showed that Smvsb3 and Lavsb3 single crystals were successfully synthesized. The Smvsb3 single crystal showed antiferromagnetism with TN=4.3 K. It was highly anisotropic in magnetism, but weakly anisotropic in electrical transport. However, the Lavsb3 single crystal exhibited paramagnetism and obvious anisotropy in electrical transport. The positive magnetoresistance of Smvsb3 was about 36% at 6 K and 7 T. At 200 K and 7 T, the magnetoresistance remained about 6%; and the MR of Lavsb3 reached 15.8% at 6 K and 7 T; and no saturation was observed at the maximum magnetic field. Conclusions: The strikingly distinct properties observed between two isostructural and homologous compounds demonstrate that rare-earth element substitution enables systematic magnetic modulation across this material family.
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基本信息:
中图分类号:O782
引用信息:
[1]张佳龙,周易,万阿敏,等.RVSb_3(R=Sm, La)单晶制备及物性研究[J].中国计量大学学报,2025,36(03):447-453.
基金信息:
国家自然科学基金项目(No.52471020)