Quantized spin waves in the metallic state of magnetoresistive manganites

Abstract

High resolution spin waves measurements have been carried out in ferromagnetic (F) La(1-x)(Sr,Ca)xMnO3 with x(Sr)=0.15, 0.175, 0.2, 0.3 and x(Ca)=0.3. In all q-directions, close to the zone boundary, the spin wave spectra consist of several energy levels, with the same values in the metallic and the x\approx 1/8 ranges. Mainly the intensity varies, jumping from the lower energy levels determined in the x\approx 1/8 range to the higher energy ones observed in the metallic state. On the basis of a quantitative agreement found for x(Sr)=0.15 in a model of ordered 2D clusters, the spin wave anomalies of the metallic state can be interpreted in terms of quantized spin waves within the same 2D clusters, embedded in a 3D matrix.

4 pages, 5 figures

References in corpus (5)

• Short-range polaron correlations in the ferromagnetic La(1-x)Ca(x)MnO(3)
• Evolution of spin-wave excitations in ferromagnetic metallic manganites
• Orbital polaron lattice formation in lightly doped La1-xSrxMnO3
• Spin waves throughout the Brillouin zone and magnetic exchange coupling in ferromagnetic metallic manganites La${}_{1-x}$Ca${}_x$MnO${}_3$ ($x=0.25,0.30$)
• Domain Formation and Orbital Ordering Transition in a Doped Jahn-Teller Insulator

Cited by in corpus (5)

• Neutron scattering studies on stripe phases in non-cuprate materials
• Spin-wave excitations in the ferromagnetic-metallic and in the charge, orbital and spin ordered states in Nd${}_{1-x}$Sr${}_x$MnO${}_3$ with x$\approx$0.5
• Charge and orbital order in transition metal oxides
• Interacting chains of orbital polarons in "Colossal" magnetoresistive La1-xSrxMnO3 revealed by spin and lattice dynamics
• The Magnon Spectrum in the Domain Ferromagnetic State of Antisite Disordered Double Perovskites