Crystal Structural Phase Transition Induced by Magnetic Field

磁场诱导的晶体结构相变

• 批准号: 12640359
• 负责人: TAJIMA Keisuke
• 金额: $ 1.09万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640359/
• 关键词: itinerant electron magnetism; magnetic phase transition; magnetic phase diagram; X-ray diffraction; magnetovolume effect; flustration; metamagnetism; 希土類金属; 四重極秩序; X線回析; ペロフスカイト化合物; 遍歴電子磁性体; マンガン酸化物

Magneto-volume effect in itinerant electron metamagnetic system has been investigated by means of x-ray diffraction under magnetic field and magnetization measurements. Results are compared with those in the localized spin system and characteristic properties in an itinerant system can be discussed.1) The magnetovolume effect in Laves phase compound Lu(CoGa)_2 which is known as a typical itinerant electron system has been investigated. Results can be well interpreted by the spin fluctuation theory.2) The first order magnetic phase transition in (FeMn)_2P is also described by the itinerant electron metamagnetic transition which is due to the interaction between two magnetic sub-bands. Results of the measurement for magnetovolume effect suggest that the band structure of paramagnetic and ferromagnetic states is different, which are expected to extend the theoretical understanding itinerant electron metamagnetism in this material.

通过磁场和磁化强度测量下的X射线衍射研究了巡回电子变磁系统中的磁体效应。将结果与局域自旋系统中的结果进行了比较，并讨论了巡回系统中的特征性质。1)研究了典型巡回电子系统Laves相化合物Lu(CoGa)_2的磁体积效应。自旋涨落理论可以很好地解释结果。2)(FeMn)_2P中的一阶磁相变也可以用由两个磁性子带之间的相互作用引起的巡回电子变磁转变来描述。磁体积效应的测量结果表明顺磁态和铁磁态的能带结构是不同的，这有望扩展对该材料中的巡回电子宏磁性的理论理解。

项目成果

S.Shimomura: "X-ray diffuse scattering study on charged-localized states of Pr_<1-x>Ca_xMnO_3 (x=0.35,0.4,0.5)"Physical Review B. vol.62. 3875-3878 (2000)

S.Shimomura：“Pr_<1-x>Ca_xMnO_3 (x=0.35,0.4,0.5)带电局域态的 X 射线漫散射研究”《物理评论 B》第 62 卷。

K.Tajima: "Magnetic phase transitions and lattice changes in rare earth metals studied by x-ray diffraction under magnetic field."Materials Transactions JIM. 8. 1040-1045 (2000)

K.Tajima：“通过磁场下的 X 射线衍射研究稀土金属的磁相变和晶格变化。”Materials Transactions JIM。

S.Shimomura, T.Tonegawa, K.Torashima, K.Tajima, N.Wakabayashi, H.Kuwahara, Y.Tomioka, Y.Tokura: "X-ray Diffuse Scattering from (Nd_<1-y>Sm_y)_<1-x>Sr_xMnO_3 and Pr_<1-x>Ca_xMn0O_3"AIP Conference Proceedings. 554. 437-441 (2001)

S.Shimomura、T.Tonekawa、K.Torashima、K.Tajima、N.Wakabayashi、H.Kuwahara、Y.Tomioka、Y.Tokura：“来自 (Nd_<1-y>Sm_y)_< 的 X 射线漫散射

K.Tajima: "Magnetostriction of Dy and Ho studied by x-ray diffraction."Journal of Alloys and Compounds. vol.303-304. 276-279 (2000)

K.Tajima：“通过 X 射线衍射研究 Dy 和 Ho 的磁致伸缩。”合金与化合物杂志。

H.Ohsumi: "Magnetoelastic effect in Ho studied by x-ray diffraction."Journal of the Physical Society of Japan. 71. 1732-1739 (2002)

H.Ohsumi：“通过 X 射线衍射研究 Ho 的磁弹性效应。”日本物理学会杂志。