Study on mechanism of novel magnetic phase transitions and anomalous transport properties in rare earth sulfides

稀土硫化物新型磁相变机理及反常输运特性研究

• 批准号: 20540329
• 负责人: EBISU Shuji
• 金额: $ 2.66万
• 依托单位: Muroran Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20540329/
• 关键词: 希土類三二硫化物; 逐次磁気相転移; 異常磁気伝導; 圧力下物性; 比熱; 希土類硫化物; 単結晶; 磁気相転移; 磁場中比熱; 圧力効果; ゼーベック係数; ホール係数; 磁気抵抗効果; 強磁場磁化過程; 強磁場中冷却; 磁場中電気抵抗; 複数磁性サイト

In order to elucidate the mechanism of novel magnetic phase transitions and anomalous transport properties associated with the transitions in rare earth sulfides a-R_2S_3 (R : rare earth elements), measurements of magnetization and electrical resistivity in magnetic fields, specific heat and the Hall effect have been carried out. The a-R_2S_3 has two inequivalent R sites. It has been found out that the a-R_2S_3 except R=Gd shows successive magnetic phase transitions at which the magnetic moments on each R site order. The multiplicity of the ground state of rare earth atom on each site has also been clarified. Furthermore, novel physical properties were discovered ; one example is that the a- Sm_2S_3 shows an extremely large abrupt increase and decrease of electrical resistivity in a narrow temperature range.

为了阐明与稀土硫化物 a-R_2S_3（R：稀土元素）相变相关的新型磁相变和反常输运特性的机制，测量了磁场中的磁化强度和电阻率、比热和霍尔效应已进行。 a-R_2S_3有两个不等价的R位点。研究发现，除R=Gd外的a-R_2S_3表现出连续的磁相变，其中每个R位上的磁矩有序。每个位点上稀土原子基态的多重性也已得到阐明。此外，还发现了新的物理特性；一个例子是a-Sm_2S_3在很窄的温度范围内表现出极大的电阻率突变。

项目成果

α-Sm_2S_3の比熱

α-Sm_2S_3的比热

• 发表时间: 2011
• 作者: Y.Yamato;M.Matsukawa;et al.;牛木雄史
• 通讯作者: 牛木雄史

α-Dy_2S_3の低温物性II

α-Dy_2S_3 II的低温物理性能

• 发表时间: 2011
• 作者: Y.Murano;M.Matsukawa.;et al.;戎修二
• 通讯作者: 戎修二

δ-R_2S_3(R=Ho,Er,Tm)の低温磁性

δ-R_2S_3(R=Ho,Er,Tm)的低温磁性

• 发表时间: 2010
• 作者: Y. Kota;T. Takahashi;H. Tsuchiura and A. Sakuma;松川倫明;新井伸英,原口数正,榎下俊平,小林義彦,阿部浩二,中村仁,浅井吉蔵;戎修二;松川倫明;内田雅大,小林義彦,佐藤博彦,大石克嘉,増渕伸一,浅井吉蔵,風間重雄;I.V.Solovyev;松川倫明;谷村知紀
• 通讯作者: 谷村知紀

α-R_2S_3(R=Gd,Tb)の磁場中比熱

α-R_2S_3(R=Gd,Tb)磁场比热

• 发表时间: 2011
• 作者: I.V.Solovyev;Z.V.Pchelkina;高橋信
• 通讯作者: 高橋信

α-Dy_2S_3の低温物性

α-Dy_2S_3的低温物理性能

• 发表时间: 2011
• 作者: Y. Kobayashi;T. Ohishi;T. Kaneko;M. Iwata;and K. Asai;C.Sekine;戎修二
• 通讯作者: 戎修二