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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

100%

Babonas G., Leonyuk L., Maltsev V., Szymczak R., Reza A., Baran M., Dapkus L.

Acta Physica Polonica A

2001

vol. 100

issue 4

553-563

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.

Ellipsometric Studies of NdMnO_3 Single Crystals

100%

Babonas G., Reza A., Szymczak R., Baran M., Shiryaev S., Fink-Finowicki J., Szymczak H.

Acta Physica Polonica A

2004

vol. 105

issue 1-2

197-208

Ellipsometric studies of NdMnO_3 single crystals of orthorhombic symmetry were carried out in the spectral range 0.5-5.0 eV. Experimental data, which were obtained on the (001)_{pc}-type planes of pseudo-cubic system, were analyzed in the model of biaxial crystal. For the first time, three componentsε_x,ε_y,ε_z of the effective dielectric function for manganites of orthorhombic symmetry were determined. From ellipsometric data, the spectra of optical conductivity and loss function were also calculated and considered. The fine structure of the spectra and optical anisotropy was the basis for discussion of the microscopic origin of the optical transitions responsible for the optical features. The electronic excitations due to dipole-forbidden spin-allowed transitions of the d-d-type in Mn-ions, f-f-type in Nd-ions and charge-transfer 2p(O)-3d(Mn) transitions were taken into account. The data for NdMnO_3 were compared with those obtained for other related undoped and doped single crystals of perovskite-type structure, LaMnO_3, (LaBa)(MnCo)O_3 and (LaCa)CoO_3.

Optical Response of La_{1-x}MnO_3/Al_2O_3 Films

100%

Babonas G., Reza A., Szymczak R., Baran M., Fröhlich K., Jasutis V., Diduszko R.

Acta Physica Polonica A

2003

vol. 103

issue 1

77-83

La_{1-x}MnO_3 films grown by metal organic chemical vapor deposition technique on r-plane cut Al_2O_3 substrates were investigated. The change of the optical response over the La_{1-x}MnO_3/Al_2O_3 sample surface was investigated along with the temperature dependence of magnetization. The mostly pronounced difference in the spectra of dielectric function occurred in the region of the d-d transitions of Mn-ions. The changes in the optical spectra and magnetic properties were correlated to the structural features of thin film.

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3 Acta Physica Polonica A

1 2004

1 2003

1 2001

3 Babonas G.

3 Baran M.

3 Reza A.

3 Szymczak R.

1 Dapkus L.

1 Diduszko R.

1 Fink-Finowicki J.

1 Fröhlich K.

1 Jasutis V.

1 Leonyuk L.

1 Maltsev V.

1 Shiryaev S.

1 Szymczak H.

Search results

Physical Properties of (M_2Cu_2O_3)_m(CuO_2)_n (M = Ca, Sr, Bi) Single Crystals with Bi-2212 Phase on their Surface

Ellipsometric Studies of NdMnO_3 Single Crystals

Optical Response of La_{1-x}MnO_3/Al_2O_3 Films