Abstract
A very large increase in electrical conductivity by several orders of magnitude is obtained when an external magnetic field is applied to colossal magnetoresistance materials such as La−Ca−Mn−O. The magnetoresistance is strongly temperature dependent and exhibits a sharp peak below room temperature that can be shifted by adjusting the composition or processing parameters. The control of lattice geometry or strain (e.g., by chemical substitution, epitaxial growth, or post-deposition anneal of thin films) appears to be crucial in obtaining colossal magnetoresistance properties. The orders-of-magnitude change in electrical resistivity could be useful for various magnetic and electric device applications.
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