简介: |
Heavy fermion materials have served as a classical prototype of strongly correlated electron systems (SCES), where exotic quantum states emerge, such as anti-ferromagnetism, superconductivity and multipolar orbital ordering, due to the correlation effects between localized f and conduction electrons. In the first part of the talk, I will discuss the Cd-doping and pressure tuning of the heavy fermion superconductor CeCoIn5, where and spin-droplets nucleate around the Cd-dopants forming an inhomogeneous electronic state, in contrast to the general uniform tuning scenario. In the second part, we focus on the “hidden order” in some heavy fermion materials such as URu2Si2 and PrFe4P12 in particular. Point-contact spectroscopy is applied to explore the nature of the “hidden order” to reveal the dichotomy of localization and itineracy in f electron systems.
Reference:
• S. Seo+, et al., Nature Physics 10, 120 (2014);
• Y. Chen, et al. Phys. Rev. Lett. 114, 146403 (2015) ;
• X. Lu et al., Phys. Rev. B 85, 020402(R) (2012)
|
