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  • Grain-size-induced collapse of variable range hopping and promotion of ferromagnetism in manganite ▫${\rm La_{0.5}Ca_{0.5}MnO_3}$▫ [Elektronski vir]
    Novosel, Nikolina ...
    Among transition metal oxides, manganites have attracted significant attention because of colossal magnetoresistance (CMR) - a magnetic field-induced metal-insulator transition close to the Curie ... temperature. CMR is closely related to the ferromagnetic (FM) metallic phase which strongly competes with the antiferromagnetic (AFM) charge ordered (CO) phase, where conducting electrons localize and create a long range order giving rise to insulator-like behavior. One of the major open questions in manganites is the exact origin of this insulating behavior. Here we report a dc resistivity and magnetization study on manganite ▫${\rm La_{1-x}Ca_xMnO_3}$▫ ceramic samples with different grain size, at the very boundary between CO/AFM insulating and FM metallic phases ▫$x=0.5$▫. Clear signatures of variable range hopping (VRH) are discerned in resistivity, implying the disorder-induced (Anderson) localization of conducting electrons. A significant increase of disorder associated with the reduction in grain size, however, pushes the system in the opposite direction from the Anderson localization scenario, resulting in a drastic decrease of resistivity, collapse of the VRH, suppression of the CO/AFM phase and growth of an FM contribution. These contradictory results are interpreted within the standard core-shell model and recent theories of Anderson localization of interacting particles.
    Source: Crystals [Elektronski vir]. - ISSN 2073-4352 (Vol. 12, iss. 5, May 2022, art. 724 (22 str.))
    Type of material - e-article ; adult, serious
    Publish date - 2022
    Language - english
    COBISS.SI-ID - 108635395

    Link(s):

    https://www.mdpi.com/2073-4352/12/5/724
    DOI

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