Orbital-driven Variation of Electronic Structures in Tetragonal La1/2Sr1/2MnO3as Investigated by Optical Spectroscopy
- 15 February 2002
- journal article
- research article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 71 (2) , 613-617
- https://doi.org/10.1143/jpsj.71.613
Abstract
Optical conductivity spectra (σ(ω)) were investigated for coherently strained epitaxial films of tetragonal La 1/2 Sr 1/2 MnO 3 with various c / a ratios (1.04, 1.00, and 0.98). With decreasing c / a , σ(ω) in the ground state shows a successive dramatic change from an insulating gap-like to metallic but highly incoherent spectrum, then to a pseudo-gap one, which reflects the strain-induced e g orbital ordering/disordering and the resultant different spin structures. The variation of the electronic structure induced by such a strain-orbital coupling is discussed in comparison with some theoretical models.Keywords
This publication has 33 references indexed in Scilit:
- Anisotropic optical signatures of orbital and charge ordering inPhysical Review B, 2000
- Layered Magnetic ManganitesAnnual Review of Materials Science, 2000
- Phase Diagram of Tetragonal ManganitesPhysical Review Letters, 2000
- Temperature-dependent scattering rate and optical mass of ferromagnetic metallic manganitesPhysical Review B, 1999
- Tetragonal to monoclinic transition in the metallic antiferromagnetPhysical Review B, 1999
- Two-Dimensional Charge-Transport and Spin-Valve Effect in the Layered AntiferromagnetPhysical Review Letters, 1999
- The role of strain in magnetic anisotropy of manganite thin filmsApplied Physics Letters, 1997
- Phase Diagram and Anisotropic Transport Properties of Nd1-xSrxMnO3 CrystalsMRS Proceedings, 1997
- Determination of Optical Constants from Intensity Measurements at Normal IncidenceApplied Optics, 1968
- Interaction between the-Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite StructurePhysical Review B, 1951