title: Heavy fermions and quantum phase transitions.
abstract: Quantum phase transitions arise in many-body systems because of competing interactions that promote rivaling ground states. Recent years have seen the identification of continuous quantum phase transitions, or quantum critical points, in a host of antiferromagnetic heavy-fermion compounds. Studies of the interplay between the various effects have revealed new classes of quantum critical points and are uncovering a plethora of new quantum phases. At the same time, quantum criticality has provided fresh insights into the electronic, magnetic, and superconducting properties of the heavy-fermion metals. We review these developments, discuss the open issues, and outline some directions for future research.
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA. qmsi@rice.edu
authors.forename: Qimiao
authors.initials: Q
authors.lastname: Si
authors.forename: Frank
authors.initials: F
authors.lastname: Steglich