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Structural Determination of Epitaxial Formations in Layered Cuprates

100%
Leonyuk L., Maltsev V., Babonas G.-J.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 1
143-146
EN
The fragment approximation is used for the description of the layered cuprate structures. The characteristic structural features are distinguished which genetically relate all the layered cuprates. The classification scheme for the whole family of layered cuprates is analyzed in the fragment approximation and a possible extension of the scheme is discussed.
2
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Epitaxial Intergrowth of Isostructural Phases in Bi-2212 Single Crystals

100%
Babonas G.-J., Leonyuk L., Maltsev V.
Acta Physica Polonica A
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1997
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vol. 92
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issue 1
251-254
EN
The isostructural phases in Bi-2212-type HTSC were studied by structural and optical methods. The epitaxial intergrowth was shown to be a feature typical of single crystals composed of several isostructural phases. The physical properties of the multi-phase samples were interpreted on the basis of reference mono-phase samples. A presence of the intergrowth interface was assumed to be responsible for particular features in multi-phase samples.
3
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Physical Properties of (M_2Cu_2O_3)_m(CuO_2)_n (M = Ca, Sr, Bi) Single Crystals with Bi-2212 Phase on their Surface

76%
Babonas G., Leonyuk L., Maltsev V., Szymczak R., Reza A., Baran M., Dapkus L.
Acta Physica Polonica A
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2001
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vol. 100
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issue 4
553-563
EN
The structural, optical, and magnetic properties are studied in the (M_2Cu_2O_3)_m(CuO_2)_n-type single crystals with the surface on which the Bi-2212-type phase was indicated. The physical properties of such samples were interpreted to some extent by the contributions of two phases. When the secondary phases on the surface of the samples were removed by mechanical polishing or etching by Ar^{+}-ion plasma, the physical properties were typical of the (M_2Cu_2O_3)_m(CuO_2)_n-type crystals. The optical method was shown to be effective for indication of secondary Bi-rich phases on the surface of (M_2Cu_2O_3)_m(CuO_2)_n samples.
4
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Magnet with Ferromagnetic Nearest-Neighbor and Antiferromagnetic Next-Nearest-Neighbor Exchange Interactions

64%
Szymczak R., Szymczak H., Kamieniarz G., Szukowski G., Jaśniewicz-Pacer K., Florek W., Maltsev V., Babonas G.
Acta Physica Polonica A
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2009
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vol. 115
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issue 5
925-930
EN
Magnetic properties of Pb[Cu(SO_4)(OH)_2] (linarite) natural single crystals were studied by magnetization and specific heat measurements. The angular dependences of magnetization were revealed which correlated with the regularities of the crystal structure. At about 2.8 K this quasi-one-dimensional Heisenberg system undergoes a phase transition to the long-range antiferromagnetic order with antiparallel magnetic moments aligned probably along the b-axis. The antiferromagnetic order is evidenced by the metamagnetic transition and pronounced λ-type anomaly at T_N in the specific heat. Using phenomenological modeling based on a quantum transfer-matrix method, we argue that at higher temperatures linarite is a quasi-one-dimensional system with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange interactions.
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