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.

在磁场和磁化测量值下，已经通过X射线衍射研究了巡回电子元磁系统中的磁体积效应。将结果与局部自旋系统中的结果进行比较，并且可以讨论流动系统中的特性性能。1）研究了已称为典型巡回电子系统的Laves相化合物LU（COGA）中的磁载效应。结果可以通过自旋波动理论来很好地解释。2）（femn）_2p中的一阶磁相变向（巡回电子元磁过渡）也描述了这是由于两个磁性磁带之间的相互作用。测量的磁载效应的结果表明，顺磁和铁磁状态的带结构不同，这有望扩大该材料中的理论理解巡回电子元磁性。

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。

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。

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, H.Ohsumi, G.Masada: "Magnetostriction in rare earth metals studied by X-ray diffraction."Nihon ouyou jikigakkaishi (in Japanese). 24. 110-115 (2000)

K.Tajima、H.Ohsumi、G.Masada：“通过 X 射线衍射研究稀土金属的磁致伸缩。”Nihon ouyou jikigakkaishi（日语）。