酸化希土類鉄(II,III)の電荷-スピン秩序とその緩和

稀土铁(II,III)氧化物中的电荷自旋序及其弛豫

• 批准号: 08640469
• 负责人: KOHN Kenichirou
• 金额: $ 1.54万
• 依托单位: Waseda University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640469/
• 关键词: Charge order; spin order; dielectric dispersion; terroel ectrics; Lu Fe, O4; rare earth iron oxide; domain wall; glass transition; YFe_2O_4酸化物; ダイポールグラス; 三角格子; フラストレーション; 誘電緩和; フェルベイ転移; 酸化ルテチウム・鉄(II,III); フェルベ-転移; 電子ホッピング; YFe_2O_4型酸化物

We observed two structures in the temperature dependence of low-frequency dielectric constant measured between 16 Hz and 1 MHz. A peak around 340 K was related to the transition between two different states of the charge ordering. Wide distribution of the relaxation times and a peak of the third order dielectric constant were characteristic to the transition. Such glassy nature was attributed to freezing of domains of short range charge ordering. The dispersion in the lower temperature range from 150-250 K was nearly of the Debye type and originated from the motion of the boundaries between the domains with spontaneous polarization whose presence was demonstrated by the pyroelectric measurement..

我们观察到在16赫兹和1 MHz之间测量的低频介电常数随温度变化的两种结构。340K附近的峰与电荷有序的两个不同态之间的跃迁有关。弛豫时间的宽广分布和三阶介电常数的峰值是转变的特征。这种玻璃化的性质归因于短程电荷有序结构域的冻结。在150-250K的较低温度范围内，色散几乎是德拜型的，并且起源于自发极化磁畴之间边界的运动，热释电测量证实了这种运动的存在。

项目成果

N.IKEDA,S.NOHDO,Y.YAMADA,.E.TAKAHASHI and K.KOHN: "Charge Ordering of LuFe_2O_4 Observed by an Anomalous X-ray Dispersion" Korean Journal of Physics. 32. S165-S168 (1998)

N.IKEDA、S.NOHD​​O、Y.YAMADA、.E.TAKAHASHI 和 K.KOHN：“异常 X 射线色散观察到的 LuFe_2O_4 的电荷排序”韩国物理学杂志。

E.TAKAHASHI,K.KOHN and N.IKEDA,: "Dielectric Dispersion and Charge Oedering of LuFe_2O_4"Korean Journal of Physics. 32. S44-S46 (1998)

E.TAKAHASHI、K.KOHN 和 N.IKEDA，：“LuFe_2O_4 的介电色散和电荷 Oedering”，韩国物理学杂志。

E.TAKAHASHI,K.KOHN and N.IKEDA: "Dielectric Dispersion and Charge Ordering of LuFe_2O_4" Korean Journal of Physics. 32. S44-S46 (1998)

E.TAKAHASHI、K.KOHN 和 N.IKEDA：“LuFe_2O_4 的介电色散和电荷排序”韩国物理学杂志。

E.TAKAHASHI, K.KOHN and N.IKEDA: "Dielectric Dispersion and Charge Ordering of LuFe_2O_4" Koeran J.Phys.(印刷中).

E. TAKAHASHI、K. KOHN 和 N. IKEDA：“LuFe_2O_4 的介电色散和电荷排序”Koeran J. Phys（出版中）。

E. TAKAHASHI, K. KOHN and N. IKEDA: "Dielectric Dispersion and Charge Ordering of LuFeィイD22ィエD2OィイD24ィエD2"Korean Journal of Physics. 32. S165-168 (1998)

E. TAKAHASHI、K. KOHN 和 N. IKEDA：“LuFe D22 D2 O D24 D2 的介电色散和电荷排序”《韩国物理学杂志》32. S165-168 (1998)。