Hyperfine interactions and local environment of 57Fe probe atoms in perovskite CaMn7O12

被引:25
作者
Presniakov, I. A. [1 ]
Rusakov, V. S. [1 ]
Gubaidulina, T. V. [1 ]
Sobolev, A. V. [1 ]
Baranov, A. V. [1 ,2 ]
Demazeau, G.
Volkova, O. S. [1 ,3 ]
Cherepanov, V. M. [4 ]
Goodilin, E. A. [1 ]
Knot'ko, A. V. [1 ]
Isobe, M. [5 ]
机构
[1] Moscow MV Lomonosov State Univ, Moscow 119992, Russia
[2] Univ Bordeaux 1, CNRS, ICMCB, F-33608 Pessac, France
[3] Russian Acad Sci, Inst Radiotechn & Elect, Moscow 125009, Russia
[4] Russian Res Ctr, Kurchatov Inst, Moscow 123182, Russia
[5] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
关键词
D O I
10.1103/PhysRevB.76.214407
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Mossbauer spectroscopy has been applied for studying the local environment of Fe-57 probe atoms within iron-doped CaMn7O12 manganite with a perovskite-like structure. The Fe-57 spectra recorded in the paramagnetic temperature range 90 K<T<380 K, where CaMn7O12 has a rhombohedral structure (R (3) over bar), were discussed supposing Fe3+ probe cations to replace manganese in the octahedral (Mn3+O6) and (Mn4+O6) polyhedra. A very small (<3%) part of Fe3+ probe cations characterized by very large quadrupole splitting (similar to 2 mm/s) suggests that a few amounts of Fe-57 probe can be substituted for Mn3+ in the (9e) positions with approximately a square planar surrounding. In the temperature range 380 K<T<450 K, the Fe-57 Mossbauer spectra undergo a sharp change which can be due to a formation (at T-CO similar to 380 K) and a gradual growth with temperature of the cubic manganite phase (Im<(3)over bar>). At T >= 450 K, the Fe-57 spectrum reveals single Fe3+ sites in an oxygen symmetric octahedral surrounding. This can be well explained by a fast electron exchange Mn3+< - >Mn4+, leading to the crystallographic equivalence of all MnO6 positions. At the temperature range T<T-M2 (=90 K), an appearance of the distributions of the hyperfine magnetic field values at the Fe-57 nucleus up to similar to 350 kOe (at 77.4 K) was observed. This result is an independent experimental evidence of magnetic ordering in the manganese sublattice.
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页数:9
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