Resistivity and magnetisation measurements were done with bulk and thin-film samples of La 0.5 Ca 0.5 MnO 3 . Bulk samples showed an antiferromagnetic insulating ground state as expected for this composition, whereas thin films demonstrated a ferromagnetic metallic ground state. This effect is attributed to the film adhesion to the substrate which prevents the lattice distortions necessary for the charge and antiferromagnetic ordering that occur in the bulk samples.
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Nyeanchi et al. (1999) studied this question.
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