Journal
PHYSICAL REVIEW B
Volume 76, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.76.174413
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The role of quenched disorder on the magnetic phase transition of ferromagnetic manganites is investigated through the field and pressure dependence of magnetization around T-C. Our results demonstrate that moderate-small chemical disorder promotes second-order behavior. This can be rationalized on the basis of a simple thermodynamic model in which the magnetic order parameter is coupled to the lattice, this coupling being sensitive to chemical disorder. A plausible microscopic scenario is also discussed.
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