Localized 4f-electrons in the quantum critical heavy fermion ferromagnet CeRh6Ge4

• 作者: An Wang Feng Du Yongjun Zhang David Graf Bin Shen Ye Chen Yang Liu Michael Smidman Chao Cao Frank Steglich Huiqiu Yuan
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（14）
• 所属期刊栏目: ARTICLES
• 页码范围: 1389-1394
• 页数: 6页
• 语种: 英文

摘要

Ferromagnetic quantum critical points were predicted to be prohibited in clean itinerant ferromagnetic systems,yet such a phenomenon was recently revealed in CeRh6Ge4,where the Curie temperature can be continuously suppressed to zero under a moderate hydrostatic pressure.Here we report the observation of quantum oscillations in CeRh6Ge4 from measurements using the cantilever and tunnel-diode oscillator methods in fields up to 45 T,clearly demonstrating that the ferromagnetic quantum criticality occurs in a clean system.In order to map the Fermi surface of CeRh6Ge4,we performed angle-dependent measure-ments of quantum oscillations at ambient pressure,and compared the results to density functional the-ory calculations.The results are consistent with the Ce 4f electrons remaining localized and not contributing to the Fermi surface,suggesting that localized ferromagnetism is a key factor for the occur-rence of a ferromagnetic quantum critical point in CeRh6Ge4.