Critical behavior of La0.67-y (Sr, Ba, Ca)(0.33+y)Mn1-xSnxO3 (x=0.01, 0.02, y=0, 0.07) perovskites
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Assaridis, H.
Panagiotopoulos, I.
Moukarika, A.
Papaefthymiou, V.
Bakas, T.
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Springer
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peer reviewed
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Hyperfine Interactions
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The magnetic critical behavior of the manganese perovskite series La0.67-y (Sr; Ba; Ca) 0.33+y Mn1-xSnxO3 (x = 0.01, 0.02, y = 0, 0.07) is studied by means of dc magnetic measurements and Sn-119 Mossbauer spectroscopy. The structure can be described by a rhombohedral unit cell (space group R-3C) for the samples where the A-site is occupied by La and Sr or La and Ba ions and orthorhombic unit cell (space group Pnma) for the samples where the A-site is occupied by La and Ca ions. Arrott and scaling plots show that the samples, where the A-site is occupied by La and Sr or La and Ba ions, follow the behavior of a conventional second-order ferromagnetic transition. In contrast, the samples that contain La and Ca ions in the A-site show anomalous behavior around Curie point. Mossbauer measurements show two magnetic phases below T-c. One of them exhibits stronger exchange interactions with more rapid electron transfer between Mn3+/Mn4+, compared to the other.
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mossbauer spectroscopy, critical exponents, manganese oxides, magnetic measurements, ferromagnetic manganites, doped manganites, phase-separation, transition
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<Go to ISI>://000243556400021
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en
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Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών