Abstract
We present a Raman scattering study of , a material that exhibits coexisting magnetic order and high-temperature superconductivity for , but becomes semiconducting for . A pronounced anomaly of an oxygen vibration at the magnetic transition temperature evolves smoothly through the superconductor-semiconductor transition. In contrast, a previously observed, broad low-energy mode disappears rapidly with increasing , mirroring the rapid hole-concentration dependence of the net magnetization in the magnetically ordered state. We discuss these findings as possible indications of spin, charge, and orbital order of the Ru ions.
- Received 6 March 2006
DOI:https://doi.org/10.1103/PhysRevB.73.172502
©2006 American Physical Society