METALS NEAR A ZERO-TEMPERATURE MAGNETIC INSTABILITY

摘要

Zero-temperature magnetic phase transitions exhibit an abundance of nearly critical magnetic fluctuations leading to unusual low-temperature properties that have become known as non-Fermi liquid (NFL) behavior. For the prototypical heavy-fermion compound CeCu_(6-x)Au_x this transition may be tuned by either Au concentration, hydrostatic pressure, or magnetic field. In the system UCu_(5-x)Pd_x, strong disorder affects the NFL properties. The d-electron Laves phase ZrZn_2 was recently found to display superconductivity in coexistence with itinerant ferromagnetism.