日程 : 2021年8月30日(月) 10:00 - 11:00
場所 : オンライン
講師 : Prof. Huiqiu Yuan
所属 : Center for Correlated Matter and Department of Physics, Zhejiang University
主催 : 強磁場コラボラトリー
世話人 : 小濱 芳充
e-mail : firstname.lastname@example.org
In correlated electron systems, a magnetic transition can be continuously suppressed to zero temperature upon applying a non-thermal parameter such as pressure, magnetic field or doping, giving rise to a quantum critical point (QCP), around which unconventional superconductivity and non-Fermi liquid behavior may appear . In this talk, I will briefly present our recent progresses on the studies of magnetic quantum criticality in the d- and f-electron compounds, with focus on the observations of field-induced antiferromagnetic quantum criticality in CdAs1-xPx, and pressure-induced ferromagnetic quantum criticality in CeRh6Ge4. In CdAs1-xPx, the first-order antiferromagnetic order shows highly unusual behavior in a magnetic field. On the other hand, it has been widely believed that a ferromagnetic quantum critical point is avoided in a pure system . Here, I will show you the first compelling evidence for the existence of a pressure-induced ferromagnetic quantum critical point and its associated strange metal behavior in a clean heavy-fermion compound CeRh6Ge4 , which shows characteristics of localized magnetism  and anisotropic hybridization . If time allows, I will also briefly present the results of CeRhIn5 measured under high pressure or/and high magnetic field .
 Z. F. Weng et al., Rep. Prog. Phys. 79, 094503 (2016).
 M. Brando et al., Rev. Mod. Phys. 88, 025006 (2016) and references therein.
 B. Shen et al., Nature 579, 51 (2020).
 A. Wang et al., Science Bulletin 66, 1389 (2021)
 Y. Wu et al., PRL 126, 216406 (2021)
 L. Jiao et al., PRB 99, 045127 (2019); PNAS 112, 673 (2015); A. Wang et al., unpublished.