Gigantic responses of physical properties in rare-earth sesquisulfides arising from metastable multiple magnetic structures and its control using external fields or environmental factors

我培养了具有正交晶体结构的α型稀土倍半硫化物单晶，并通过磁化率、电阻率、塞贝克系数和比热的测量，阐明了这些单晶的物理性质在低于约10 K的低温下，偶尔对温度、磁场大小或电场方向表现出陡峭或巨大的响应。我相信这些现象起源于目前物质的亚稳态多重结构；因此，我的目标是利用外部磁场或环境因素控制磁相来控制物理性质，从而通过设计磁场应用程序成功地揭示了倍半硫化镝α - dy2s3单晶中新的磁相。

I have grown single crystals of alpha type rare-earth sesquisulfides having an orthorhombic crystal structure and clarified that the physical properties of these single crystals occasionally demonstrate steep or gigantic responses to temperature, magnitude or direction of magnetic field and electrical field in low temperatures below about 10 K through the measurements of magnetization, electrical resistivity, Seebeck coefficient and specific heat. I am convinced these phenomena originate from metastable multiple structures in the present matter; therefore, I aimed for control of physical properties via controlling magnetic phase using external fields or environmental factors and consequently succeeded in revealing novel magnetic phase in single crystal of dysprosium sesquisulfide alpha-Dy2S3 by contriving application-procedure of magnetic field.