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    Wyświetlanie 1-7 z 7
    Tytuł:
    Mulliken Occupation as the Indicator of Transition to Superconducting State in SrFe₂As₂ and BaFe₂As₂
    Autorzy:
    Goraus, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398653.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.40.Kb
    71.15.Mb
    74.25.Dw
    Opis:
    Basing on the ab initio calculations performed within full potential local orbital minimum basis method, the Mulliken occupation of the Sr 5s $(n_{5s})$ and Ba 6p $(n_{6p})$ states can serve as an indicator of transition to the superconducting state in doped SrFe₂As₂ and BaFe₂As₂ compounds where the iron was substituted with cobalt or in the pristine compounds under pressure. The estimated pressure, at which both compounds exhibit superconductivity based on Sr 5s and Ba 6p occupation is in good agreement with the recently published experimental data.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 655-658
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lanthanide Contraction in $RENi_5$ (RE~=~La, Ce, Nd, Sm, Eu, Gd, Tb,~Yb) Compounds Studied with Band Structure Calculations
    Autorzy:
    Goraus, J.
    Maślankiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426989.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.20.Lp
    71.27.+a
    31.15.E-
    Opis:
    Full potential linearized augmented plane wave band structure calculations were performed for hexagonal $RENi_5$ (RE = rare earth) compounds in order to investigate reproducibility of lanthanide contraction by ab initio studies. The a and c parameters were optimised using a paraboloid fit, starting from the same initial values for all compounds studied. The trend in lattice parameters across the RE series obtained from the calculations was found to be in general agreement with experimental data. A comparison of results obtained by generalized gradient approximation and generalized gradient approximation with additional Coulomb correlations calculations is presented for several double counting schemes.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1076-1078
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric properties of Ca₂Sn/Ca₃SnO
    Autorzy:
    Kalinowski, L.
    Fijałkowski, M.
    Goraus, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1047668.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Jf
    66.70.Df
    Opis:
    We measured thermopower, thermal conductivity and electrical resitivity for Ca₂Sn sample across 4-350 K temperature range. Contrary to expectations from recent DFT based calculations the thermopower is not particularly large, reaching 7 μV at 350 K. The thermoelectric figure of merit renders this material in unmodified form practically unusable for thermoelectric aplications.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 384-386
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic structure of TmPdIn
    Autorzy:
    Penc, B.
    Kurleto, R.
    Goraus, J.
    Starowicz, P.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065057.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    71.15.Mb
    79.60.Bm
    Opis:
    Electronic structure of a ternary TmPdIn compound, which crystallizes in the hexagonal ZrNiAl-type structure, was studied by X-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy. Density of states in the valence band was calculated by means of the augmented plane wave/local orbital method based on density functional theory. The results showed that the valence band is formed mainly of Tm 4f and Pd 4d states. In the ultraviolet photoemission spectra one can distinguish Pd 4d maximum and Tm 4f multiplet peaks, which are displaced with respect to those of pure Tm.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1184-1186
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric Properties of Heavy Fermion Compound Ce₃Co₄Sn₁₃
    Autorzy:
    Witas, P.
    Kalinowski, L.
    Goraus, J.
    Fijałkowski, M.
    Ślebarski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385439.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    72.15.Eb
    72.15.Jf
    Opis:
    The heavy fermion compound Ce₃Co₄Sn₁₃ was studied in terms of its thermoelectric properties. To enhance its figure of merit we milled the solid sample and then pressed to obtain a consistent granulated material. The main properties, such as the Seebeck coefficient, thermal conductivity and electronic resistivity were measured at low (< 300 K) temperatures for both, the solid and the granulated sample. Thermal conductivity was diminished and the Seebeck coefficient was slightly enhanced, while the resistivity of produced material was increased. We explain it by strong electron scattering on defects and grain boundaries present in the sample. The resulting figure of merit ZT was found to be enhanced almost across the whole measured T region.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 309-311
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specific Heat and Magnetic Properties of Single-Crystalline $(Zn_{0.925}In_{0.054})[Cr_{1.84}In_{0.152}]Se_4$ Semiconductor
    Autorzy:
    Malicka, E.
    Groń, T.
    Pacyna, A.
    Ślebarski, A.
    Goraus, J.
    Gągor, A.
    Mydlarz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409656.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.Ba
    75.50.Ee
    75.50.Pp
    Opis:
    An antiferromagnetic order with a Néel temperature $T_{N}$ = 17.5 K, a strong ferromagnetic exchange evidenced by a positive Curie-Weiss temperature $\Theta_{CW}$ = 77.3 K, the fuzzy peaks in the real component of susceptibility χ'(T) and the disappearance of the second critical field were established. The curvature of specific heat C(T) and C(T)/T in surrounding of $T_{N}$ indicated a broad peak, characteristic for the system with inhomogeneous magnetic state (spin-glass-like phase). The calculated magnetic entropy showed the value of S(T) ≈ 1 J/(mol K) which is extremely small; i.e., much lower than the magnetic contribution Rln(2S + 1) = 11.52 J/(mol K) calculated for the spin 3/2.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1108-1110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Valence Band of $Ce_2Co_{0.8}Si_{3.2}$ and $Ce_2RhSi_3$ Studied by Resonant Photoemission Spectroscopy and FPLO Calculations
    Autorzy:
    Starowicz, P.
    Kurleto, R.
    Goraus, J.
    Walczak, Ł.
    Penc, B.
    Adell, J.
    Szlawska, M.
    Kaczorowski, D.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374249.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.Mb
    71.20.Eh
    74.25.Jb
    Opis:
    This work presents studies of the valence band of two Kondo lattice systems: $Ce_2Co_{0.8}Si_{3.2}$, which is paramagnetic with the Kondo temperature $T_{K}$ ≈50 K and $Ce_2RhSi_3$, which is antiferromagnetic below $T_{N}$=4.5 K and exhibits $T_{K}$ ≈9 K. The photoemission spectra, which are obtained with photon energy tuned to Ce 4d-4f resonance, reveal a Kondo peak at the Fermi energy $(E_{F})$, its spin-orbit splitting partner at 0.24 eV and a broad maximum related to Ce $f^0$ final state. The spectra indicate that Kondo peak has a higher intensity for $Ce_2Co_{0.8}Si_{3.2}$. The off-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards $E_{F}$ for $Ce_2Co_{0.8}Si_{3.2}$ as compared to $Ce_2RhSi_3$. Full-potential local-orbital calculations were realized with local spin density approach +U approach for 213 stoichiometry. They show that a higher density of states near $E_{F}$ is observed for $Ce_2CoSi_3$. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of $Ce_2RhSi_3$ and $Ce_2CoSi_3$, respectively.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-144-A-147
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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