The infrared absorption of charge density waves coupled to a magnetic background is first observed in two manganites La1-xCaxMnO3 with x = 0.5 and x = 0.67. In both cases a BCS-like gap 2Δ\(T\), which for x = 0.5 follows the hysteretic ferromagnetic-antiferromagnetic transition, fully opens at a finite T0<TN, with 2Δ\(T0\)/kBTc∼=5. These results may also explain the unusual coexistence of charge ordering and ferromagnetism in La0.5Ca0.5MnO3.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)