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    Introducing cationic vacancies in (La0.5Ca0.5)zMnO3 significantly reduces resistance by eight orders of magnitude. This leads to a transition from charge ordering to antiferromagnetic–ferromagnetic states, enabling colossal magnetoresistance above room temperature.

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    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Solid-State Chemistry

    Background:

    • Perovskite manganites like (La0.5Ca0.5)zMnO3 exhibit complex electronic and magnetic properties.
    • Understanding the relationship between cationic vacancies and electronic phase transitions is crucial for materials design.

    Purpose of the Study:

    • To investigate the impact of cationic vacancies on the electrical resistance and magnetic properties of (La0.5Ca0.5)zMnO3.
    • To explore the emergence of colossal magnetoresistance (CMR) effects in relation to structural and magnetic changes.

    Main Methods:

    • Controlled introduction of cationic vacancies into the (La0.5Ca0.5)zMnO3 lattice.
    • Electrical resistance measurements as a function of temperature and magnetic field.
    • Magnetic susceptibility measurements to identify magnetic transitions.

    Main Results:

    • An eight-orders-of-magnitude decrease in electrical resistance was observed with increasing cationic vacancies at constant electronic density.
    • The charge ordering state disappeared, coinciding with the emergence of an antiferromagnetic–ferromagnetic transition.
    • Colossal magnetoresistance values exceeding 1000% were achieved above room temperature.

    Conclusions:

    • Cationic vacancies are a powerful tool to tune the electronic and magnetic properties of (La0.5Ca0.5)zMnO3.
    • The observed resistance drop is directly linked to the suppression of charge ordering and the induction of ferromagnetism.
    • The material demonstrates potential for applications in magnetic sensors and memory devices operating at room temperature.