title: Quantum critical behavior in heavy electron materials.
abstract: Quantum critical behavior in heavy electron materials is typically brought about by changes in pressure or magnetic field. In this paper, we develop a simple unified model for the combined influence of pressure and magnetic field on the effectiveness of the hybridization that plays a central role in the two-fluid description of heavy electron emergence. We show that it leads to quantum critical and delocalization lines that accord well with those measured for CeCoIn5, yields a quantitative explanation of the field and pressure-induced changes in antiferromagnetic ordering and quantum critical behavior measured for YbRh2Si2, and provides a valuable framework for describing the role of magnetic fields in bringing about quantum critical behavior in other heavy electron materials.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;Collaborative Innovation Center of Quantum Matter, Beijing 100190, China; and yifeng@iphy.ac.cn david.pines@gmail.com.
authors.forename: Yi-feng
authors.initials: YF
authors.lastname: Yang
authors.affiliation: Santa Fe Institute and Department of Physics, University of California, Davis, CA 95616 yifeng@iphy.ac.cn david.pines@gmail.com.
authors.forename: David
authors.initials: D
authors.lastname: Pines
mesh_terms: D000465:Algorithms; D002563:Cerium / Q000737:chemistry; D055598:Chemical Phenomena; D004553:Electric Conductivity; D004583:Electrons; D060526:Magnetic Fields; D008962:Models, Theoretical; D044367:Phase Transition; D011312:Pressure; D011789:Quantum Theory; D044366:Transition Temperature; D015018:Ytterbium / Q000737:chemistry
chemical_list: D002563:Cerium; D015018:Ytterbium
keywords: heavy fermion; quantum criticality; two-fluid model