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Investigation of Strongly Correlated Electron Systems using Multi-Extreme Conditions

使用多种极端条件研究强相关电子系统

基本信息

批准号：
10304029
负责人：
FUJITA Toshizo
金额：
$ 21.25万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

The objectives of this project are to establish laboratory techniques for measuring fundamental properties of materials under various extreme conditions, including low temperatures, high pressures, strong magnetic fields and their combinations, and to apply the experimental techniques to controlling and understanding a variety of anomalous properties of the strongly correlated f- and d-electron systems from electronic points of view. The following is a summary of our research results which we performed during 3 years. We also published 34 papers in relation to this project.1) Established techniques are for measurements of electric resistivity and magnetic susceptibility at low temperatures down to 15 mK in high fields up to 12 T, of specific heat and elastic modulus down to 60 mK up to 14 T, of resistivity down to 1.5 K under high pressures up to 8 GPa, and of resistivity and specific heat under triple-extreme conditions of temperature down to 100 mK, field up to 8 T and pressure up to 2 GPa.2) We performed various measurements on f-electron compounds : CeSb, CeRu_2, CeFe_2, CeTe_2, LuB_<12>, CeNiSn, Ce(Ni, Cu)Sn, YbPtSn UPt, UNiSn, UNiAl, UirGe, URhGe, UCu_2Sn,d-electron Oxide : La_<1-x>Sr_xCuO_4, La_<2-x-y>Nd_ySr_xCuO_4, Sr_2RuO_4, Sr_<3-x>Ca_xRu_2O_7.3) We revealed a number of anomalous ground states with characteristic orders including antiferromagnetism, ferromagnetism, 2-dimensional d-wave Superconductivity, p-wave superconductivity, ferro-quadrupole order, antiferro-quadrupole order, intermediate valence state.

该项目的目标是建立在各种极端条件下测量材料基本性质的实验室技术，包括低温、高压、强磁场及其组合，并应用实验技术从电子角度控制和理解强关联f电子和d电子系统的各种反常性质。以下是我们三年来研究成果的总结。我们还发表了34篇与该项目有关的论文。1)建立了12 T以下高场15mK以下的电阻率和磁化率的测量技术，14T以下60mK以下的比热和弹性模数的测量方法，8 GPa以下高压下1.5K以下的电阻率和比热的测量方法，以及温度100mK、电场8T和压力2 GPa三种极端条件下的电阻率和比热的测量方法。2)我们对f电子化合物进行了各种测量：CeSb，Ceru_2，CeFe_2，CeEe_2，Lub_lt；12电子氧化物：La_xCuO_4，La_x&gt；CaxRu_2O_7.3)，我们发现了一些具有特征有序的反常基态，包括反铁磁性、铁磁性、二维d波超导、p波超导、铁四极序、反铁四极序、中间价态。