Construction of Constant Pressure Generator and AC calorimetric measurements of Ce_2RhIn_8

Ce_2RhIn_8恒压发生器的构建及交流量热测量

• 批准号: 16540311
• 负责人: UMEHARA Izuru
• 金额: $ 2.3万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540311/
• 关键词: high pressure; specific heat; ac method; constant pressure generation; low temperature; 強相関電子; 磁性; 低音物性; 物性実験; 交流比熱

It was succeeded in constructing the constant pressure generation system under the pressure up to 4GPa and in the temperature down to 0.75K. The important point to make it possible is using MP30 metal for pressing rod. This is the first system of the world.We have also constructed the ac caloric measurement system for low temperature and high pressure. In order to make it possible to measure ac calorimetric data, we constructed the new spot welding system. It was spot welded 20 μm Au and Au-Fe0.07 thin wire thermocouples on the samples. We have been measured the heat capacity of CePd_2Si_2 and Ce_2RhIn_8 for the test of this measurement system. It is clearly seen that the anti-ferro magnetic ordering temperature T_N decreases increasing pressure and the jump at T_N smears under the high pressure. This result suggests that Kondo temperature increases and magnetic fluctuation is dominated under high pressure in this material.

它成功地在4GPA的压力下构建了恒定压力产生系统，并在温度下降到0.75K。使它成为可能的重要点是使用MP30金属进行压杆。这是世界上第一个系统。我们还为低温和高压构建了AC热量测量系统。为了使AC Calolimetric数据成为可能，我们构建了新的点焊接系统。它是样品上的20μmAu和au-fe0.07薄导线热电偶的斑点。为了测量系统的测试，我们已经测量了CEPD_2SI_2和CE_2RHIN_8的热容量。可以清楚地看出，抗铁磁有序温度T_n降低了压力的增加，在高压下T_N涂片时的跳跃。该结果表明，在该材料的高压下，在高压下，北极温度升高，磁波动占主导地位。

项目成果

Revelation of Ni magnetic moment in GdNi single crystal by soft X-ray magnetic circular dichroism

软X射线磁圆二色性揭示GdNi单晶中Ni磁矩

• 发表时间: 2005
• 期刊: Solid State commun. 136
• 作者: K.Yano;I.Umehara;K.Sato;A.Yaresko
• 通讯作者: A.Yaresko

Desigh of micro pressure cell for measurements of specific heat and magnetization

用于比热和磁化强度测量的微压力盒设计

• 发表时间: 2004
• 期刊: Jouranal of Magnetism and Magetic Material 272-276
• 作者: M.Nachida;S.Miyashita;Izuru Umehara 他
• 通讯作者: Izuru Umehara 他

The magnetic moment of Ni in the Laves phase compound GdNi_2

Laves相化合物GdNi_2中Ni的磁矩

• 发表时间: 2005
• 期刊: Physica B 367
• 作者: K.Yano;I.Umehara;T.Miyazawa;Y.Adachi;K.Sato
• 通讯作者: K.Sato

Design of micro pressure cell for the measurements of magnetization and specific heat

用于磁化强度和比热测量的微压力盒设计

• 发表时间: 2004
• 期刊: J.Magn.Magn.Mater. 272-276
• 作者: I.Umehara;F.Tomioka;A.Tsuboi;T.Ono;M.Hedo;Y.Uwatoko
• 通讯作者: Y.Uwatoko

The effect of pressure on magnetism in CeAg

压力对 CeAg 磁性的影响

• 发表时间: 2005
• 期刊: Journal of Physics : Condensed Matter 17
• 作者: Hiroshi;Kohno;Yoshiya Uwatoko 他
• 通讯作者: Yoshiya Uwatoko 他