Journal
PHYSICAL REVIEW B
Volume 64, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.64.172410
Keywords
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Magnetization and resistivity measurements have been performed in (La1-xCax)(z)MnO3-delta perovskites as a function of x, z, and delta around the charge-ordered state. Fifty percent of Ca ions stabilize the charge-ordered state even for Mn4+ as low as 40% whereas reducing that impurity concentration to 35% results in a conducting ferromagnetic state even for 50% of Mn4+ ions. A model is proposed in which Ca ions act not only as suppliers of holes but as attractors of doped-in holes.
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