Experimental Study of New Universality Classes in Magnetic Phase Transition

磁相变新普适类的实验研究

• 批准号: 05640409
• 负责人: AJIRO Yoshitami
• 金额: $ 1.22万
• 依托单位: FUKUI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640409/
• 关键词: Phase transition; Universality; Phase diagram; Triangular lattice; One-dimensional magnet; Quantum spin; 磁気相転移; 三角格子反強磁性体

The purpose of the present research is to elucidate the phase transitions in low dimensional magnetic system, such as frustrated triangular lattice antiferromagnet and quantum spin one-dimensional antiferromagnet.We performed the experimental study on various model substances using nuclear magnetic resonance (NMR), electron spin resonance (ESR), neutron scattering, susceptibity and high field magnetization maeasuments.1.Triangular lattice antiferromagnetOur precise measurements between 1.4K and 300K under static magnetic fields up to 40 T,occasionally up to 110 T,revealed a rich variety of magnetic phase transitions in the stacked triangular lattice antiferromagnets ABX3 and AMO2, including a novel phase transition which belongs to a new universality class linked to chiral degeneracy.The magnetic field versus temoerature phase diagrams are classified into two types depending on their magnetic antisotropies.2.Quantum spin systemNonmagnetic groud states due to quantum spin effect were studied for one-dimensional Heisenberg systems.We observed remarkable differneces in the nonmagnetic impurity efect on the Haldane system, spin-Peierls system and alternating linear chain system and disscussed the physical sihnificance of the results.

本研究的目的是阐明低维磁系统中的相变，例如沮丧的三角形晶格抗fiferromagnet和量子旋转一维抗fifermagnet。 1.三角晶格抗铁磁铁在长达40吨的静态磁场下进行1.4k至300​​k之间的精确测量，偶尔揭示了在堆叠的三角形三角形粘液效应于ABX3和AMO2的堆叠式磁相中的各种磁相过渡，包括新的相位，包括新的链接，包括新的链接，属于新的链接，属于新的链接，属于新的链接。磁场与温度的相图被分为两种类型，具体取决于它们的磁反应性。2.QuantumSpin Systy SystemnonMagnetic Groud groud状态由于量子自旋效应而导致的一维海森堡系统，我们观察到了一个显着的物理杂物，并且在旋转系统中，旋转式链型固定型，旋转式链接，旋转式链接，旋转式链接，旋转式链接，并具有旋转式链接，旋转式链接，旋转式链接，并具有旋转的链接式固定性。结果的敏捷性。

项目成果

M.Chiba: "Anomalous Spectrum of ^<133>Cs NMR in CsCuCl_3 around the Applied Field 11T" J.Phys.Soc.Jpn.62. 4186-4189 (1993)

M.Chiba：“应用场11T周围CsCuCl_3中^ 133 Cs NMR的反常谱”J.Phys.Soc.Jpn.62。

Y.Ajiro: "High Field Magnetization Process in Triangular Lattice Antiferromagnet CuFeO_2" Physica B. 201. 71-74 (1994)

Y.Ajiro：“三角晶格反铁磁体 CuFeO_2 中的高场磁化过程”Physica B. 201. 71-74 (1994)

Y.Ajiro, T.Asano, T.Takagi, M.Mekata, H.Katori, T.Goto: "High Field Magnetization Process in Triangular Lattice Antiferromagnet CuFe02" Physica B. 201. 71-74 (1994)

Y.Ajiro、T.Asano、T.Takagi、M.Mekata、H.Katori、T.Goto：“三角晶格反铁磁体 CuFe02 中的高场磁化过程”Physica B. 201. 71-74 (1994)

M.Chiba, Y.Ajiro, T.Morimoto: "NMR Study on the Quantum Spin Effect on the One-Dimensional Magnet in High Magnetic Fields" Physica B. 201. 200-203 (1994)

M.Chiba、Y.Ajiro、T.Morimoto：“高磁场中一维磁体的量子自旋效应的核磁共振研究”Physica B. 201. 200-203 (1994)

M.Chiba: "Anomalous Spectrum of ^<133>Cs NMR in CsCuCl_3 around the Applied Field IPT" J.Phys.Soc.Jpn.62. 4186-4189 (1993)

M.Chiba：“应用场IPT周围CsCuCl_3中^ 133 Cs NMR的反常谱”J.Phys.Soc.Jpn.62。