Superconductivity and Fermi surface around quantum critical point

量子临界点附近的超导和费米面

• 批准号: 21340102
• 负责人: SETTAI Rikio
• 金额: $ 12.56万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21340102/
• 关键词: フェルミ面; ドハース・ファンアルフェン効果; 量子臨界点; 磁性; 超伝導

We have investigated the relationship between heavy fermion superconductivity and magnetism, especially in the noncentrosymmetic pressure-induced superconductor CeIrSi_3. Antiferromagnetism disappears and superconductivity appears around 2 GPa in CeIrSi_3. The antiferromagnetism is induced by applying the magnetic field, and the antiferromagnetism competes with superconductivity. The superconducting upper critical field H^<c2> is suppressed in the field-induced antiferromagneic phase. With increasing pressure the field-induced antiferromagnetic phase moves to very high magnetic field and the H^<c2> is extremely enhanced.

我们已经研究了重型效率超导性和磁性之间的关系，尤其是在非中心压力诱导的超导体CEIRSI_3中。抗铁磁性消失，CEIRSI_3中有2个GPA出现超导性。抗铁磁性是通过施加磁场引起的，而抗磁场的抗铁磁场则具有超导性竞争。超导临界场h^<c2>在田间诱导的抗铁磁相中被抑制。随着压力的增加，场诱导的抗铁磁相移至非常高的磁场，并且H^<c2>的增强非常增强。

项目成果

Strong Field Quenching of the Quasiparticle Effective Mass in Heavy Fermion Compound YbCo2Zn20

• DOI: 10.1143/jpsj.79.083601
• 发表时间: 2010-08-01
• 期刊: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
• 影响因子: 1.7
• 作者: Ohya, Masahiro;Matsushita, Masaki;Onuki, Yoshichika
• 通讯作者: Onuki, Yoshichika

Magnetic Penetration Depth and Gap Symmetry of the Noncentrosymmetric Superconductors CePt3Si and LaPt3Si

非中心对称超导体CePt3Si和LaPt3Si的磁穿透深度和间隙对称性

• 发表时间: 2009
• 期刊: J.Phys.Soc.Jpn. 78
• 作者: R.L.Ribeiro;et al.
• 通讯作者: et al.

Heavy Fermion State in YbIr<SUB>2</SUB>Zn<SUB>20</SUB>

YbIr<SUB>2</SUB>Zn<SUB>20</SUB> 中的重费米子态

• DOI: 10.1143/jpsj.78.123711
• 发表时间: 2009
• 期刊: Journal of the Physical Society of Japan
• 影响因子: 1.7
• 作者: S. Yoshiuchi;R. Settai;K. Sugiyama;Y. Onuki;et al.
• 通讯作者: et al.

Electronic structure of YbCu_2Ge_2 studied by soft x-ray angle-resolved photoemission spectroscopy

软X射线角分辨光电子能谱研究YbCu_2Ge_2的电子结构

• DOI: 10.1103/physrevb.84.195121
• 发表时间: 2011
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: A.Yasui;Y.Onuki;et al
• 通讯作者: et al

Field-Induced Antiferromagnetic State in a Pressure-Induced Superconductor CeIrSi_3

压力感应超导 CeIrSi_3 中的场感应反铁磁态

• DOI: 10.1143/jpsjs.80sa.sa069
• 发表时间: 2011
• 期刊: Journal of the Physical Society of Japan, Supplement
• 作者: R.Settai;Y.Onuki;et al
• 通讯作者: et al