physica status solidi (b) · 1999 · 31 citations · 0 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsAntiferromagnetic MaterialsAntiferromagnetismMagnetic Properties Of SolidsMagnetism In SolidsRaman SpectroscopyMagnetic ScatteringRaman ScatteringRaman Scattering Cross SectionsSpontaneous Raman SpectroscopyStimulated Raman Scattering
The S = 1/2 two-leg spin ladder has a short range magnetic correlation, which induces a spin gap similar to high-Tc superconductors in the underdoped region. Magnetic excitations were investigated by Raman scattering on single crystals of Sr14—x—yCaxYyCu24O41. Anisotropic exchange energies, spin gap, two-hole bound state and its dissociation were studied as a function of the carrier concentration.