21 April 2000
Vol 288, Issue 5465

About The Cover

Cover image expansion

COVER The interactions and coupling between the charge, spin, orbital, and lattice degrees of freedom play an important role in determining the electronic and magnetic ordering of strongly correlated electron systems. The illustrations depict the available symmetries for the electron wave functions of the five d orbitals in the perovskite transition-metal oxides. A special section on correlated electron systems begins on page 461 [Images: Y. Tokura and N. Nagaosa]