Abstract
We report extensive muon-spin-rotation measurements on the lightly doped compound, which allows us to disentangle the effect of disorder, controlled by random substitution, from that of mere doping. A three-dimensional phase diagram of lightly doped cuprates is accurately drawn. It shows a quantum critical point around which a thermally activated antiferromagnetic phase competes with superconductivity. Disorder suppresses both the competing order parameters and the quantum critical point, unveiling an underlying frozen state.
- Received 25 June 2010
DOI:https://doi.org/10.1103/PhysRevB.82.100503
©2010 American Physical Society