Heavy fermion state inpressme-indumd superconductor studied by the de Haas-van Alphen effect under pressure

压力下德哈斯-范阿尔芬效应研究重费米子态压实超导体

• 批准号: 17540325
• 负责人: SETTAI Rikio
• 金额: $ 2.45万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17540325/
• 关键词: Pressure-induced superconductor; Heavy fermion; Quantum abase transition; Qunatum critical noint; de Haas-van Alphen effect; Fermi surface; 反強磁性; dHvA効果; 圧力; 超伝導; 強相関電子系; 希土類化合物

The f electrons of cerium compounds exhibit a variety of characteristic features including spin and charge orderings, spin and valence fluctuations, heavy-fermions and anisoiropic superconductivity. In cerium compounds, the Rudemran-Kittel-Kasuya-Yosida (RKKY) interaction and the Kondo effect compete with each other. The RKKY interaction enhances the long-range magnetic order, while the Kondo effect quenches the magnetic moments of the localized f electrons. Most of the cerium compounds order antiferromagnetically with the Neel temperature T_N, because the RKKY interaction overcomes the Kondo effect at low temperatures.Recently, a new aspect of cerium and uranium compounds with magnetic ordering has been discovered. When a pressure P is applied to compounds with antiferromagnetic ordering such as CeCu_2Ge_2, CeIn_3, and CePd_2Si_2, T_N reaches zero at the quantum critical pressure Pc, and superconductivity is observed at around P_c. The transition from the magnetically ordered state to the nonmagnetic state under pressure, crossing the quantum critical point, is the most interesting issue in strongly correlated f electron systems.We have depeloped high pressure cells for the de Haas-van Alphen experiment and electrical resistivity measurement which can be rotated in the magnetic fields, and investigated the heavy fermion state including the pressure-induced superconductor, which are summarized as follows ;1. Discovery of the pressure-induced superconductor CeIrSi_3 and CeCoGe_3 and huge upper critical field with strong coupling behavior2. Split Fermi surface due to antisymmetric spin-orbit interaction based on the non-conetrosymmetric crystal structure in CeTX_3 (T : transition metal, X : Si, Ge).3. Pressure-induced heavy-fermion superconductivity in Ce_2Ni_3Ge_5 and CePt_3Si,4. Pressure phase diagram in a ferromagnet CePtAl and an antiferromagnet CeTl_3

FERON的F电子具有多种特征，包括自旋和电荷订购，自旋和价波动，重毛皮和动脉蛋白质超导性。在铜化合物中，rudemran-kittel-kasuya-yosida（rkky）相互作用和近野效应相互竞争。 rkky相互作用增强了远距离磁顺序，而近野效应却消除了局部F电子的磁矩。大多数铜质化合物与Neel温度T_N进行抗铁磁序列，因为Rkky相互作用克服了低温下的近藤效应。此外，发现了带有磁性顺序的新方面和铀化合物的新方面。当将压力P施加到具有抗磁性排序的化合物时，例如CECU_2GE_2，CEIN_3和CEPD_2SI_2时，T_N在量子临界压力PC处达到零，并且在p_c左右观察到超导性。在压力下从磁有序状态到非磁性状态的过渡，越过量子临界点，是在密切相关的F电子系统中最有趣的问题。我们已经为De Haas-Van Alphen实验和电阻率测量的DE HAAS-VAN ALPHEN实验和电气电阻率测量降低了，并且在磁场中可以旋转，并在磁场中旋转，并调查了磁性压力，并在磁场中旋转，刺激了超级构造的刺激。 ; 1。发现压力诱导的超导体CEIRSI_3和CECOGE_3以及具有强耦合行为的巨大临界场2。基于CETX_3中的非对齐对称晶体结构（T：过渡金属，X：SI，GE）的反对称性晶体结构，由于反对称自旋轨道相互作用而裂开的费米表面。3。 CE_2NI_3GE_5和CEPT_3SI中的压力诱导的重力超导率，4。铁磁性c和抗fiferromagnet cetl_3中的压力相图

项目成果

Huge Upper Critical Field and Electronic Instability in Pressure-induced Superconductor CeIrSi3 without Inversion Symmetry in the Crystal Structure

• DOI: 10.1143/jpsj.77.073705
• 发表时间: 2008-06
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: R. Settai;Y. Miyauchi;T. Takeuchi;Florence Lévy;I. Sheikin;Y. Ōnuki

Split Fermi surface properties of LaTGe3(T: Transition metal)and PrCoGe3 without the non-centrosymmetric crystal structure

无非中心对称晶体结构的LaTGe3(T：过渡金属)和PrCoGe3的分裂费米面性质

• 发表时间: 2008
• 期刊: J. Phys. Soc. Jpn. 77(印刷中)
• 作者: T. Kawai;et. al.
• 通讯作者: et. al.

The electronic state tuned by high pressure in a ferromagnet CePtA1

铁磁体 CePtA1 中高压调节的电子态

• 发表时间: 2006
• 期刊: Physica B 378
• 作者: T. Ueda;et. al.
• 通讯作者: et. al.

Pressure-Induced Heavy-Fermion Superconductivity in Antiferromagnet CeIrSi3 without Inversion Symmetry

• DOI: 10.1143/jpsj.75.043703
• 发表时间: 2006-04
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: I. Sugitani;Y. Okuda;H. Shishido;Tsutomu Yamada;A. Thamizhavel;E. Yamamoto;Tatsuma D. Matsuda;Y. Haga;T. Takeuchi;R. Settai;Y. Ōnuki

De Haas-van Alphen effect in CeTI_3 under pressure

压力下 CeTI_3 中的德哈斯-范阿尔芬效应

• 发表时间: 2007
• 作者: R.;Settai
• 通讯作者: Settai