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New Development of Heavy Electron Systeme including Transuranium Compound

超铀化合物等重电子体系新进展

基本信息

批准号：
16204026
负责人：
ONUKI Yoshichika
金额：
$ 29.87万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

We grew fifty kinds of rare earth compounds and twenty kinds of uranium and transuranium compounds and studied Fermi surface properties, magnetism and superconductivity for these compounds. Experimental results are summarized as follows :(1) The electronic state of antiferromagnets CeRhIn_5 and CeIn_5 was studied by the de Haas-van-Alphen (dHvA) experiment as a function of pressure P, where the Ne'el temperature T_N becomes zero at the critical pressure P_c: T_N → 0 at P → P_c. We clarified experimentally that the 4f - localized electronic state is changed into the 4f - itinerant one at P_c = 2.35GPa, revealing the first-order phase transition.(2) We discovered pressure-induced superconductivity for CeNiGe_3, Ce_2Ni_3Ge_5, CeIrSi_3 and Ulr. Interesting superconducting properties are observed especial in CeIrSi_3 and UIr without inversion symmetry in the crystal structure. For example, an antiferromagneitic states of CeIrSi_3 becomes superconductive around 2 GPa. Surprisingly, a large upper critical field of about 40T is found at 2.6 GPa when the magnetic field is applied to the tetragonal [001] direction. There is a possibility that spin-triplet superconductivity is realized for H//[001] in CeIrSi_3.(3) We also discovered superconductivity in NpPd_5Al_2 with the transition temperature T_sc = 5K Moreover, we succeeded in detecting the dHvA escillations in transuranium compounds of NpGe_3 and PuIn_3, indicating that 5f electrons in these compounds are itinerant.Our seven papers published in J. Phys. Soc. Jpn. were selected as Editor's Choice, and "A Drastic Change of the FermiSurface at a Critical Pressure in CeRhIn_5: dHvA Study under Pressure, H. Shishido, R. Settai, H. Harima and Y. Onuki:J. Phys. Soc. Jpn. 74 (2005) 1103-1106." was selected as" 13th J. Phys. Soc. Jpn. Paper Award ".

我们生长了50种稀土化合物和20种铀和超铀化合物，并研究了这些化合物的费米表面性质、磁性和超导电性。（1）用de Haas-van-Alphen（dHvA）实验研究了反铁磁体CeRhIn_5和CeIn_5的电子态随压力P的变化，其中Ne'el温度T_N在临界压力P_c处变为零：T_N在P → P_c处变为零。实验证实，在Pc = 2.35GPa时，4f局域电子态转变为4f巡游电子态，揭示了一级相变。(2)发现了CeNiGe_3，Ce_2Ni_3Ge_5，CeIrSi_3和Ulr的压致超导电性。特别是在CeIrSi_3和UIr晶体结构中没有反转对称性，观察到了有趣的超导性质。例如，CeIrSi_3的反铁磁态在2GPa附近变为非铁磁态。令人惊讶的是，当磁场施加到四极[001]方向时，在2.6GPa下发现约40 T的大的上临界场。在CeIrSi_3中，H//[001]有可能实现自旋三重态超导。(3)我们还发现了NpPd_5Al_2的超导电性，其转变温度T_sc = 5 K。此外，我们还成功地探测到了NpGe_3和PuIn_3的超铀化合物中的dHvA振荡，表明这些化合物中的5 f电子是巡游的。被选为编辑的选择，和“一个急剧变化的费米面在临界压力CeRhIn_5：dHvA研究压力下，H。志志多河Settai，H. Harima和Y. Onuki：J. Phys. Soc. Jpn. 74（2005）1103-1106。被选为”第13届日本物理学会“。论文奖”。

项目成果

期刊论文数量（182）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Recent advances in the magnetism and superconductivity of heavy fermion systems

DOI：
10.1143/jpsj.73.769
发表时间：
2004-04
期刊：
Journal of the Physical Society of Japan
影响因子：
1.7
作者：
Y. Ōnuki;Y. Ōnuki;R. Settai;K. Sugiyama;T. Takeuchi;Tatsuo C. Kobayashi;Y. Haga;E. Yamamoto
通讯作者：
Y. Ōnuki;Y. Ōnuki;R. Settai;K. Sugiyama;T. Takeuchi;Tatsuo C. Kobayashi;Y. Haga;E. Yamamoto

Pressure-induced Superconductivity in Ulr

Ulr 中的压力诱导超导