title: [Magnetic properties and transport behaviors in double doped La(0.67+1.33x)Sr(0.33-1.33x)Mn(1-x)Mg(x)O3 system].
abstract: The M-T curves, M-H curves, ESR curves, infrared spectrum, Raman spectrum, rho-T curves and MR-T curves of La(0.67+1.33x)Sr(0.33-1.33x)Mn(1-x)Mg(x)O3 (0.00 < or = x < or = 0.25) were studied. The experiment pointed out that all samples exhibit a paramagnetic-ferromagnetic (PM-FM) transition associated with metallic-insulating (MI) transition in the low doping region, which does not occur in the heavy doping zone. The authors suggest that this behavior is attributed to the difference between the Jahn-Teller distortion of the Mn3+ ion neighboring Mg2+ and that of the Mn3+ ion non-neighboring Mg2+, which is confirmed by the IR and Raman spectra. The anomalous transport behavior is dominated by the differerent Jahn-Teller distortion.
authors.affiliation: Materials Research Laboratory, Suzhou College, Suzhou, China.
authors.forename: Zhi-rang
authors.initials: ZR
authors.lastname: Cai
authors.forename: Wei
authors.initials: W
authors.lastname: Tong
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.forename: Bei
authors.initials: B
authors.lastname: Zhang
authors.forename: Ning
authors.initials: N
authors.lastname: Liu
authors.forename: Yu-heng
authors.initials: YH
authors.lastname: Zhang
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D007811:Lanthanum / Q000737:chemistry; D008277:Magnesium Oxide / Q000737:chemistry; D008280:Magnetics; D017895:Manganese Compounds / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013324:Strontium / Q000737:chemistry; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D017895:Manganese Compounds; D008670:Metals; D010087:Oxides; C097288:lanthanum permanganate; D008277:Magnesium Oxide; D007811:Lanthanum; D013324:Strontium