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- W2058902359 abstract "Low-field magnetic properties of ceramic La1-xCaxMnO3 (0⩽x⩽0.4) are investigated between T = 5 and 310 K. The paramagnetic-ferromagnetic transition is observed in all the samples. The dependence of the Curie temperature, TC, on x is described within a model of spin polarons associated with electronic localization. Critical behaviour of the susceptibility χ-1(T ) ~ (T-TC)γ is observed for T>TC, with the critical exponents γ = 1.20±0.05 and γ* = 1.64±0.06 below and above the composition x≈0.18 corresponding to the Mn4+ ion concentration c ≈ 0.23, respectively. For the compound with x = 0.3 no temperature hysteresis of the resistivity is observed in magnetic fields between 0 and 8 T. In all the samples the field-cooled and zero-field-cooled magnetizations deviate below TC, the difference being approximately equal to the thermoremanent magnetization (TRM). Long-time relaxation of TRM in LCMO is observed for time scales up to 104 s. The relaxation rate reaches a maximum near a wait time tW ~ 103 s. The time dependence of TRM can be described with a stretched exponential law, as in spin or cluster glasses in conditions where the observation time is comparable with tW ." @default.
- W2058902359 created "2016-06-24" @default.
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- W2058902359 date "2000-06-13" @default.
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- W2058902359 title "Coexistence of ferromagnetic and spin-glass phenomena in La<sub>1-<i>x</i></sub>Ca<sub><i>x</i></sub>MnO<sub>3</sub>(0⩽<i>x</i>⩽0.4)" @default.
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- W2058902359 doi "https://doi.org/10.1088/0953-8984/12/26/321" @default.
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