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Magnetic exchange interactions and supertransferred hyperfine fields at 119Sn probe atoms in CaCu3Mn4O12
PRESNIAKOV, Igor A.
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
RUSAKOV, Viyacheslav S.
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
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Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
PRESNIAKOV, Igor A.
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
RUSAKOV, Viyacheslav S.
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
GUBAIDULINA, Tatyana V.
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
< Reduce
Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [MSU]
Language
en
Article de revue
This item was published in
Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2012, vol. 85, n° 2, p. 024406
American Physical Society
English Abstract
The double manganite CaCu3Mn4O12 doped with 119Sn atoms (∼1 at.% with respect to manganese atoms) was studied by use of Mössbauer spectroscopy. Formally tetravalent Sn4+ ions substitute for isovalent manganese ions in the ...Read more >
The double manganite CaCu3Mn4O12 doped with 119Sn atoms (∼1 at.% with respect to manganese atoms) was studied by use of Mössbauer spectroscopy. Formally tetravalent Sn4+ ions substitute for isovalent manganese ions in the octahedral (Mn4+O6) polyhedra. The covalency effects on the magnetic interactions like superexchange in Cu2+-O-Mn4+ and Mn4+-O-Mn4+ bonds and supertransferred hyperfine interactions of the 119Sn probe atoms in the manganite structure are discussed. Using a semiquantitative nearest-neighbor cluster model relating the hyperfine magnetic field on the 119Sn nuclei (HSn = 105 kOe at T = 77 K) to covalency parameters and angle characterizing the Sn-O-M (M = Cu, Mn) bonds, it has been shown how such an analysis of supertransferred hyperfine interactions of tin probe ions can get fruitful information about strength and sign of the superexchange interactions between Mn4+ and Cu2+ magnetic ions. A consistent description of the results in the framework of the Weiss molecular field model considering the specific local environment of tin atoms has made it possible to estimate exchange integrals: JCuMn = −51.1 ± 0.3 K and JMnMn = −0.6 ± 0.2 K.Read less <
English Keywords
Magnetism
Mössbauer spectroscopy
Inorganic compounds
Origin
Hal imported