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Fermi-Surface Mapping from 2D Positron Annihilation Data

100%
Kontrym-Sznajd G., Samsel-Czekała M.
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EN
We demonstrate which kind of information on the electronic structure one can get from one-dimensional profiles, interpreted in terms of two-dimensional reconstructed densities. The conversion from one-dimensional to two-dimensional is applied to one-dimensional angular correlation of annihilation radiation profiles of divalent hexagonal close packed metals Mg and Cd. On the example of Mg we show that one should be very careful while studying the Fermi surface from electron-positron (e-p) densities folded into the first Brillouin zone.
2
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The Pressure Effects on Electronic Structure of Iron Chalcogenide Superconductors FeSe_{1-x}Te_x

81%
Ciechan A., Winiarski M., Samsel-Czekała M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 4
820-823
EN
We study the electronic structure of iron-based superconductors FeSe_{1-x}Te_x within the density functional theory. We pay particular attention to the pressure effects on the Fermi surface (FS) topology, which seem to be correlated with a critical superconducting temperature T_C of iron chalcogenides and pnictides. A reduction of the FS nesting between hole and electron cylinders with increasing pressure is observed, which can lead to higher values of T_C. The tellurium substitution into selenium sites yields FS changes similar to the pressure effect.
3
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Kondo Screening Effect and Ferromagnetic Order in UCu_2Si_2

81%
Troć R., Samsel-Czekała M., Coqblin B.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1023-1025
EN
Electrical resistivity and low temperature magnetoresistivity measurements made on a single crystal of UCu_2Si_2 are reported. By using as a phonon reference the temperature dependence of the electrical resistivity of ThCu_2Si_2 we could establish that UCu_2Si_2 has both a ferromagnetic and a Kondo behaviour. Such a phenomenon can be described by the underscreened Kondo lattice model. The magnetoresistivity revealed the presence of magnetic fluctuations within the ferromagnetic order as it was reported previously for UGe_2. Also one of the calculated Fermi surface sheets exhibits nesting properties, being in perfect agreement with the previous neutron diffraction data, supporting the possibility of a presence of the spin density wave phase. In this ternary silicide, where the strong ferromagnetic behaviour exists, this phase is signalised by magnetic fluctuations.
4
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Comparison of Various Reconstruction Techniques for Line Projections

81%
Kontrym-Sznajd G., Samsel-Czekała M., Biasini M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 5
1429-1434
EN
The most effective and popular algorithms to reconstruct the three-dimensional electron-positron momentum density from the measurements of the two-dimensional angular correlation of annihilation radiation are based on the Fourier transform or polynomial expansion. We compare the efficacy of different methods in reconstructing the momentum density of the rare-earth based compounds ErGa_3, CeIn_3 and model profiles, presenting also our new filtering algorithm.
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