J. Phys. IV France 12 (2002) Pr9-239
The stripe-liquid phase in cuprates and nickelatesJ.M. Tranquada
Physics Department, Brookhaven National Laboratory, Upton, NY 11973-5000, U.S.A.
It is well established that doped 2D antiferromagnets such as layered nickelates and certain cuprates can exhibit an ordered phase in which charge carriers are segregated to periodically-spaced domain walls separating antiferromagnetic domains. An open question concerns the nature of the state that is achieved when a stripe solid melts. Recent neutron scattering experiments on nickelates and cuprates indicate that melting leads to a stripe-liquid state; these results will be presented and discussed. The existence of the stripe-liquid phase in nickelates makes it plausible to interpret the mid-infrared absorption in terms of transitions from valence to mid-gap states associated with the stripes.
© EDP Sciences 2002