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MQR Study of Pressure induced Superconductivity in Antiferromagnetic Ce Compound.

反铁磁性 Ce 化合物中压力诱导超导性的 MQR 研究。

基本信息

批准号：
10640353
负责人：
KOHARA Takao
金额：
$ 2.11万
依托单位：
Himeji 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：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640353/
关键词：
NQR NMR Ce compound high pressure internal field Ce化合物圧力誘起超伝導 f電子系非BCS機構

项目摘要

The main purpose of this subject is for the design of high pressure cell used for the NMR/NQR measurement at low temperatures and the NMR/NQR measurement of the constituted nuclei in the pressure-Induced superconductors. In the antiferromagnetic dense-Kondo compound CeInィイD23ィエD2 (TィイD2NィエD2=10 K), a small internal field (6 kOe at 1.6 K), which is parallel to the respective Ce-In planes, appears. The non-vanishing ィイD1115ィエD1In internal field means that Ce magnetic moments orient perpendicular to the (111) plans. With applied pressure, the internal field gradually decreases and disappears above 2.44 Gpa. The nuclear spin-lattice relaxation rate, 1/TィイD21ィエD2, is nearly temperature independent in the paramagnetic state and is strongly suppressed with increasing pressure. On further cooling through TィイD2NィエD2, 1/TィイD21ィエD2 decreases rapidly with no critical slowing down phenomena at TィイD2NィエD2 and varies in proportional to temperature at very low temperatures. Fermi liquid behavior was observed below 10 K at 2.74 Gpa. The NMR/NQR on other interesting pressure-induced superconductors such as CePdィイD22ィエD2SiィイD22ィエD2, CeNiィイD22ィエD2GeィイD22ィエD2 and CeRhInィイD25ィエD2 are also now in progress.

本课题的主要目的是设计用于低温NMR/NQR测量的高压池和用于压感超导体中组成核的NMR/NQR测量。在反铁磁致密近藤化合物CeIn_xD_23_xD_2（T_xD_2N_xD_2 =10 K）中，出现了一个平行于Ce-In平面的小内场（1.6 K时为6 kOe）。Ce的磁矩垂直于（111）面取向，不为零的Ce_（111）D_（111）D_（111）In内场。随着外加压力的增加，内场逐渐减小，并在2.44 Gpa以上消失。核自旋-晶格弛豫速率，1/T D21 D2，在顺磁状态下几乎与温度无关，并且随着压力的增加而强烈抑制。在通过T D2 N D2的进一步冷却时，1/T D21 D2迅速减小，在T D2 N D2处没有临界减速现象，并且在非常低的温度下与温度成比例地变化。在2.74Gpa下，在10 K以下观察到费米液体行为。其他感兴趣的压力诱导超导体，如CePd双金属D22双金属D2 Si双金属D22双金属D2，CeNi双金属D22双金属D2 Ge双金属D22双金属D2和CeRhIn双金属D25双金属D2的NMR/NQR也正在进行中。