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- W2023557368 abstract "The relationship between electronic and magnetic properties and the lattice effect due to replacement of A-site cations with size mismatch has been studied in the La0.5Ca0.5-xBaxMnO3 system with the amount of Mn4+ fixed at 0.48. Three sorts of compound (x = 0, 0.1 and 0.2) have been prepared, and resistivity, magnetic susceptibility, thermopower and x-ray photoelectron spectroscopy (XPS) measurements were carried out. Every compound exhibits the metal-insulator transition at TMI and a ferromagnetic-paramagnetic phase transition at Tc, which is different from TMI. Decrease of Tc and increase of the magnetic susceptibility below Tc with increasing x, and complex behaviour of the resistivity are observed. It is possible to explain these results on the basis of the assumption of a phase separation into ferromagnetic metal and insulator phases. The XPS measurement result indicates that in the x = 0.2 compound, the insulator phase exists at the temperature at which ferromagnetism is observed. I find that a good fit of the thermopower data for the x = 0.2 compound is obtained by taking into account contributions of both ferromagnetic metal and insulator phases at T<Tc. It is suggested that the lattice effect with large values of not only t but also σ2 promotes the phase separation into ferromagnetic metal and Jahn-Teller insulator phases at T<Tc." @default.
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- W2023557368 date "2001-02-07" @default.
- W2023557368 modified "2023-09-23" @default.
- W2023557368 title "The phase separation due to A-site-cation size mismatch in La<sub>0.5</sub>Ca<sub>0.5-<i>x</i></sub>Ba<sub><i>x</i></sub>MnO<sub>3</sub>" @default.
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- W2023557368 doi "https://doi.org/10.1088/0953-8984/13/8/302" @default.
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