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• W2091775168 abstract "The Curie temperature ${T}_{c}$ of ferromagnetic ${mathrm{La}}_{0.7}{mathrm{A}}_{0.3}{mathrm{CoO}}_{3}$ ($A=mathrm{Ca}$, Sr, Ba) thin films was studied as a function of the film thickness $d$ for $400phantom{rule{0.3em}{0ex}}mathrm{nm}>densuremath{geqslant}2.6phantom{rule{0.3em}{0ex}}mathrm{nm}$. A finite-size shift of the critical temperature relative to the bulk value, $1ensuremath{-}{T}_{c}(d)∕{T}_{c}(mathrm{ensuremath{infty}})ensuremath{propto}{d}^{ensuremath{-}ensuremath{lambda}}$, with a constant critical shift exponent of $ensuremath{lambda}ensuremath{approx}1$ over the entire thickness range was observed. This value of $ensuremath{lambda}$ is rather unusual for thick films $(d>100phantom{rule{0.3em}{0ex}}mathrm{nm})$ and normally expected for two-dimensional magnetic structures (i.e., ultrathin magnetic films with a thickness of a few monolayers) or spin-glass systems. Measurements of the magnetoresistivity reveal spin-dependent variable range hopping in the ultrathin films, which is strongly suppressed with increasing film thickness by percolation. The occurrence of charge-carrier localization and spin-misorientation hints to an exchange interaction between isovalent Co ions and thus to a phase-separation of ferromagnetic and antiferromagnetic regions, which may be the reason for the observed unusual critical shift exponent $ensuremath{lambda}$." @default.
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• W2091775168 date "2005-03-30" @default.
• W2091775168 modified "2023-10-12" @default.
• W2091775168 title "Finite-size shift of the Curie temperature of ferromagnetic lanthanum cobaltite thin films" @default.
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• W2091775168 doi "https://doi.org/10.1103/physrevb.71.092406" @default.
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