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.

成功构建了压力高达4GPa、温度低至0.75K的恒压发生系统，其重要的一点是采用MP30金属压杆。这是世界上第一个系统。还构建了低温高压交流热量测量系统 为了能够测量交流热量数据，我们构建了新的点焊系统，该系统点焊了 20 μm Au 和 20 μm Au。我们已经测量了CePd_2Si_2和Ce_2RhIn_8样品上的Au-Fe0.07细线热电偶的热容，可以清楚地看到反铁磁有序温度T_N随着压力的增加而减小。在高压下的 T_N 涂抹结果表明，近藤温度升高，并且在该材料中磁波动占主导地位。

项目成果

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

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