Abstract
We propose a unified magnetic phase diagram of the cuprate superconductors. A new feature of this phase diagram is a broad intermediate doping region of quantum-critical, z=1, behavior, characterized by temperature independent T/ and linear T, where the high energy spin waves are not overdamped. The spin gap in the moderately doped materials is related to the suppression of the spectral weight for frequencies smaller than =c/ξ in the quantum disordered, z=1, regime. The crossover to the z=2 regime, where T/≃const, occurs only in the fully doped materials.
- Received 4 June 1993
DOI:https://doi.org/10.1103/PhysRevLett.71.2813
©1993 American Physical Society