Magnetoresistance in La(1-x)SrxCoO3 for 0.05 - x - 0.25
Vladimir Golovanov, Laszlo Mihaly, A. R. Moodenbaugh
TL;DR
This study investigates the magnetic, electrical, and structural properties of La(1-x)SrxCoO3 compounds across various doping levels, revealing a transition from semiconducting to metallic behavior and a correlation between energy gap and neutron scattering data.
Contribution
It provides new insights into the magnetoresistance and electronic phase crossover in La(1-x)SrxCoO3, supported by experimental data and a double exchange model interpretation.
Findings
Maximum magnetoresistance occurs in the semiconducting state.
Electronic properties show a crossover from semiconducting to metallic behavior.
A correlation exists between energy gap and neutron scattering energy scale.
Abstract
The dc resistivity, magnetoresistance and magnetic susceptibility of La(1-x)SrxCoO3 compounds have been investigated in the temperature range of 4K to 300K for magnetic fields up to 7 T. In the doping range studied (0.05 - x - 0.25) the electronic properties of the material exhibit a crossover from semiconducting to metallic behavior. The magnetoresistance is highest in the semiconducting state. A correlation was found between the energy gap determined from the dc conductivity and the energy scale identified from neutron scattering data. The results are interpreted in terms of a double exchange model.
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