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SUPERCONDUCTING STATE OF THE LAYERED RUTHENATE

层状钌酸盐的超导态

基本信息

批准号：
09440136
负责人：
MAENO Yoshiteru
金额：
$ 8.58万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The objective of research project is to clarify the superconducting symmetry of SrィイD22ィエD2RuOィイD24ィエD2 mainly through investigation of the specific heat and nuclear magnetic resonance. Through this research project, the quality of the single crystals of SrィイD22ィエD2RuOィイD24ィエD2 has reached an ideal level for most of the investigations.1. As a major achievement of this project, we have demonstrated by nuclear magnetic resonance that superconductivity of SrィイD22ィエD2RuOィイD24ィエD2 is spin triplet.2. We have also provided our crystals to many collaborators, who reported a number of important results. In particular, the observation of spontaneous internal field in the superconducting state by muon spin relaxation indicated that the time-reversal-symmetry is spontaneously broken in the superconducting state, another crucial characteristics of the spin-triplet state specific to SrィイD22ィエD2RuOィイD24ィエD2.3. In addition, we have succeeded in inducing superconducting multiple phases under magnetic fields, characteristic of spin-triplet supcrconductivity.4. Furthermore, we found that the superconducting transition temperature enhances by a factor of two to 3 K in a eutectic mixture of SrィイD22ィエD2RuOィイD24ィエD2 and Ru metal.5. At the same time, detailed theoretical models have been developed in order to describe both the superconducting symmetry and the pairing mechanism of SrィイD22ィエD2RuOィイD24ィエD2.

本研究项目的目的是主要通过比热和核磁共振的研究来阐明SrィイD22ィエD2RuOィイD24ィエD2的超导对称性。通过本研究项目，得到的单晶质量达到了大部分研究的理想水平。1.通过本课题的研究，锶ィイD22ィエD2RuOィイD24ィエD2单晶的质量达到了大部分研究的理想水平。作为本项目的一项主要成果，我们用核磁共振方法证明了SrィイD22ィエD2RuOィイD24ィエD2的超导电性是自旋三重态。我们还向许多合作者提供了我们的晶体，他们报告了一些重要的结果。特别是，用介子自旋弛豫观测超导态的自发内场表明，超导态的时间反转对称性自发破缺，这是自旋三重态的另一个重要特征，即SrィイD22ィエD2RuOィイD24ィエD2.3所特有的。此外，我们还成功地在磁场作用下诱导了超导多相，具有自旋三重态超导电性的特点。此外，我们还发现，在SrィイD22ィエD2RuOィイD24ィエD2和Ru金属的共晶混合物中，超导转变温度提高了2~3K。同时，我们还建立了详细的理论模型来描述超导对称性和超导配对机制，如：SrィイD22ィエD2RuOィイD24ィエD2。