Fermi surface studies near magnetic quantum critical points under high pressure

高压下磁量子临界点附近的费米表面研究

• 批准号: 14340111
• 负责人: TERASHIMA Taichi
• 金额: $ 8.9万
• 依托单位: National Institute for Materials Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340111/
• 关键词: high pressure; magnetic field; de Haas-van Alphen effect; strong electron correlation; ferromagnetism; superconductivity; Fermi surface; antiferromagnetism; フェルミ面; 圧力; 有機伝導体

1.We have developed piston-cylinder high-pressure cells suitable for de Haas-van Alphen (dHvA) effect measurements at pressures up to 3 GPa, using non-magnetic high-strength alloy NiCrAl.2.We have measured the dHvA effect in the ferromagnetic superconductor UGe_2 up to 〜2 GPa, exceeding the critical pressure, for the magnetic field parallel to the magnetic easy a-axis. We have found that the enhancement of quasiparticle mass at high pressures is not directly related to the ferromagnetic-paramagnetic transition at the critical pressure but is ascribed to the so-called T_x transition.3.We have measured the dHvA effect in ZrZn_2, which was reported to be a ferromagnetic superconductor, at pressures up to -2 GPa. We have found from detailed analyzes of exchange splitting of the Fermi surface a crossover between two magnetic states induced by the magnetic field and have proposed that UGe_2 and ZrZn_2 may have a common temperature-pressure-magnetic-field phase diagram.4.We have measured the dHvA effect in CeIn_3, which exhibits superconductivity near the antiferromagnetic-paramagnetic transition, at pressures up to 〜3 GPa. We have found the appearance of new Fermi surfaces at the critical pressure of the antifermmagnetism and have also found pronounced changes of the Fermi surface at other pressures. Those observations indicate that the change of the electronic structure accompanying the antiferromagnetic-paramagnet is transition occurs successively.

1.我们使用非磁性高强度合金NICRAL NICRAL.2。我们已经在高达3 GPA的压力下开发了适合De Haas-Van Alphen（DHVA）效应测量的高压高压细胞。2。我们测量了DHVA在富含超磁性的磁场中的DHVA效应，从而超过了竞争力的磁场，超过了〜2 gpa，超出了〜2 gpa，均超过〜2 gpa。 a-axis.We have found that the enhancement of quasiparticle mass at high pressures is not directly related to the ferromagnetic-paramagnetic transition at the critical pressure but is assigned to the so-called T_x transition.3.We have measured the dHvA effect in ZrZn_2, which was reported to be a ferromagnetic superconductor, at pressures up to -2 GPa.我们从磁场引起的两个磁性状态之间的交换的详细分析中发现，UGE_2和ZRZN_2可能具有常见的温度压力压力 - 磁性磁场图。4。我们已经在Cein_3中测量了Cein_3，在Cein_3中表现出了超导率均可迁移，而the the Eustricdires attrycparemagnentic antifermagagnentic artifermagnentic arif-paramnentic arif-paramnentic〜 GPA。我们已经在抗手势的临界压力下发现了新的费米表面的出现，并且还发现了在其他压力下Fermi表面的事实变化。这些观察结果表明，发生的电子结构的变化成功发生了抗磁性 - paramagnet。

项目成果

T.Terashima, S.Uji, 他7名: "Magnetic phase diagram and the pressure and field dependence of the Fermi surface in UGe_2"Physical Review B. 65・17. 174501-1-174501-5 (2002)

T.Terashima、S.Uji 等 7 人：“磁相图以及 UGe_2 中费米表面的压力和场依赖性”物理评论 B. 65・17（2002 年）

Global Phase Diagram of the Magnetic Field-Induced Organic Superconductors λ-(BETS)_2Fe_xGal-_xCl_4

磁场诱导有机超导体λ-(BETS)_2Fe_xGal-_xCl_4的整体相图

• 发表时间: 2003
• 期刊: Journal of the Physical Society of Japan 72・2
• 作者: S.Uji;T.Terashima他
• 通讯作者: T.Terashima他

Pressure-induced Fermi surface change in quasi-one-dimensional conductor β"-(ET)(TCNQ)

准一维导体β"-(ET)(TCNQ)中压力引起的费米面变化

• 发表时间: 2004
• 期刊: Journal de Physique IV 114
• 作者: S.Yasuzuka;T.Terashima;S.Uji 他
• 通讯作者: S.Uji 他

Fermi surface studies of the ferromagnetic superconductor UGe_2 under high pressure

高压铁磁超导体UGe_2的费米面研究

• 发表时间: 2003
• 期刊: Acta Physica Polonica B 34
• 作者: T.Yamamizu;et al.;T.Terashima et al.
• 通讯作者: T.Terashima et al.

T.Terashima, S.Uji他: "The Fermi Surface in the Kondo Semiconductor CeNiSn"PHYSICA B. 329-333. 535-536 (2003)

T.Terashima、S.Uji 等人：“近藤半导体 CeNiSn 中的费米表面”PHYSICA B. 535-536 (2003)。