Abstract
We report electronic Raman scattering experiments on a superconducting single crystal in a magnetic field. At low temperatures, the spectral weight of the high-energy two-magnon peak increases linearly with field and is amplified by a factor of more than two at 14 T. The effect disappears at elevated temperatures and is not present in undoped . This observation is discussed in terms of an electronically inhomogeneous state in which the field enhances the volume fraction of a phase with local antiferromagnetic order at the expense of the superconducting phase.
- Received 6 September 2004
DOI:https://doi.org/10.1103/PhysRevLett.94.107009
©2005 American Physical Society