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Wyszukujesz frazę "Tobola, J." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effect of Alloying with Ca in LaMnO$\text{}_{3}$ System Studied by KKR-CPA Method and Giant Magnetoresistance
    Autorzy:
    Tobola, J.
    Kaprzyk, S.
    Pierre, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964825.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    Opis:
    La$\text{}_{1-x}$ Ca$\text{}_{x}$MnO$\text{}_{3}$ perovskites show semiconducting properties in the paramagnetic range. The gap is reduced near x=0.33, where ferromagnetic ordering is observed. The ferromagnetic ordering then induces a semiconductor-metal transition, and gives rise to a giant magnetoresistance effect. The ground state electronic structure calculations were done with KKR-CPA method for hypothetical cubic and ferromagnetic LaMnO$\text{}_{3}$ and CaMnO$\text{}_{3}$ compounds, as well as for disordered La$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ (x=0.33, 0.4, 0.5) alloys with real crystal data. As a result, we get a magnetic moment per formula 4.00μ$\text{}_{B}$ and 3.00μ$\text{}_{B}$ and half-metallic behaviour for end-compounds, respectively. In the ferromagnetic region a linear decrease in the magnetic moment of La$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ is observed, together with the decrease in the gap width for spin-down carriers, if doping Ca in La$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$. A simple model is developed, which describes magnetic and transport properties as resulting from an exchange-induced band-crossing semiconductor-metal transition, as for instance in EuO.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 461-464
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interplay of Crystal Structure Preference and Magnetic Ordering in High Entropy CrCoFeNiAl Alloys
    Autorzy:
    Jasiewicz, K.
    Kaprzyk, S.
    Tobola, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030461.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Nc
    71.20.Be
    71.23.-k
    75.50.Bb
    Opis:
    In this work, some relations between crystal structure and magnetic ordering in CrCoFeNiAl HEAs are discussed in view of the KKR-CPA calculations. Remarkably, it is noticed that the transition between fcc and bcc phases in the analysed CrCoFeNi_{x}Al and CrCoFeNiAl_{x} alloys is closely related to change in ordering of the local magnetic moments, namely the magnetic moment on Cr is either parallel (ferromagnetic) or antiparallel (ferrimagnetic) to the magnetic moments of other atoms (Co, Fe and Ni). On the whole, the theoretical diagram showing the fcc-bcc phase preference and their coexistence vs. alloy composition well corroborates with available experimental data.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 511-513
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Study of Substitution of Si for Ge in Mn$\text{}_{5}$Ge$\text{}_{3}$
    Autorzy:
    Siberchicot, B.
    Henrion, R.
    Toboła, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956494.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Be
    75.50.Cc
    75.10.Lp
    Opis:
    The substitution of silicon for germanium in Mn$\text{}_{5}$Ge$\text{}_{3}$ leads to a decrease in the magnetization for x < 0.7 and then to phase transition toward a non-collinear antiferromagnetic order for Mn$\text{}_{5}$Si$\text{}_{3}$. The magnetic properties of Mn$\text{}_{5}$Ge$\text{}_{3}$ and Mn$\text{}_{5}$(Ge$\text{}_{0.5}$Si$\text{}_{0.5}$)$\text{}_{3}$ are analyzed by means of band structure calculations.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 467-470
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Electronic Structure of the RMn$\text{}_{2}$Ge$\text{}_{2}$ (R = Ca, Y, La, Ba) Antiferromagnets
    Autorzy:
    Toboła, J.
    Malaman, B.
    Venturini, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013367.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.15.Nc
    75.20.En
    75.20.Hr
    75.50.Ee
    Opis:
    The electronic structure of the tetragonal RMn$\text{}_{2}$Ge$\text{}_{2}$ (R = Ca, Y, La, Ba) antiferromagnets is presented using the self-consistent Korringa-Kohn-Rostoker method. According to the neutron refinements, two types of collinear antiferromagnetic structure are taken into account: AF$\text{}_{1}$ for YMn$\text{}_{2}$Ge$\text{}_{2}$ and AF$\text{}_{2}$ for the other compounds. The calculated magnetic moments on Mn: 2.17μ$\text{}_{B}$ (YMn$\text{}_{2}$Ge$\text{}_{2}$), 2.84 μ$\text{}_{B}$ (CaMn$\text{}_{2}$Ge$\text{}_{2}$), 2.95 μ$\text{}_{B}$ (LaMn$\text{}_{2}$Ge$\text{}_{2}$), and 3.47 μ$\text{}_{B}$ (BaMn$\text{}_{2}$Ge$\text{}_{2}$) remain in good agreement with the neutron data (in μ$\text{}_{B}$) 2.20, 2.67, 3.05, and 3.66, respectively. As seen on antiferromagnetic density of states, all systems are metallic, however BaMn$\text{}_{2}$Ge$\text{}_{2}$ is found near semimetallic limit. The total energy Korringa-Kohn-Rostoker computations on CaMn$\text{}_{2}$Ge$\text{}_{2}$, performed in both antiferromagnetic phases, result in preferring of the AF $\text{}_{2}$ structure.zap
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 761-765
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    $\text{}^{119}$Sn Hyperfine Fields in RMn$\text{}_{6}$Sn$\text{}_{6}$ (R = Mg, Zr, Hf). Experimental and Theoretical Study
    Autorzy:
    Mazet, T.
    Toboła, J.
    Venturini, G.
    Malaman, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013348.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Jx
    76.30.Lh
    71.15.Mb
    75.20.En
    Opis:
    We performed both $\text{}^{119}$Sn Möossbauer experiments and electronic structure calculations using the Korringa-Kohn-Rostoker method on the hexagonal RMn$\text{}_{6}$Sn$\text{}_{6}$ (R = Mg, Zr, and Hf) compounds. According to previous neutron diffraction results two types of commensurate magnetic order are investigated: ferromagnetic for R = Mg and antiferromagnetic for R = Zr and Hf. From $\text{}^{119}$Sn Möossbauer measurements, high transferred hyperfine fields on the tin nuclei are observed. The H$\text{}_{hf}$ values are well supported by the Korringa-Kohn- Rostoker results. Moreover, the calculated μ$\text{}_{Mn}$ are in good agreement with the neutron diffraction data. When observing the density of states, ZrMn$\text{}_{6}$Sn$\text{}_{6}$ is found near semimetallic limit.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 737-740
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity, Weak Itinerant Ferromagnetism and Electronic Band Structure of Y$\text{}_{9}$Co$\text{}_{7}$
    Autorzy:
    Kołodziejczyk, A.
    Wiendlocha, B.
    Zalecki, R.
    Toboła, J.
    Kaprzyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047310.pdf
    Data publikacji:
    2007-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Jb
    74.25.Ha
    74.20.Mn
    Opis:
    The paper presents experimental results for the intermetallic compound Y$\text{}_{9}$Co$\text{}_{7}$ which is the first very weak itinerant ferromagnetic superconductor. The measurements of electrical resistivity, susceptibility, magnetization, specific heat, nuclear magnetic resonance, and other properties show the magnetic transition at T$\text{}_{C}$≈ 4.5 K and the onset of superconductivity at about T$\text{}_{S}$≈ 2.5 K, revealing the coexistence state within a temperature interval below T$\text{}_{S}$. A few of the results are shortly reviewed and discussed. We focus attention on our recent ultraviolet photoemission spectroscopy and their comparison with our band structure calculations. Interpretations are considered which take into account the characteristic structure of the compound and different possible types of magnetic ordering.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 4; 513-526
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelastic Properties of MnRhAs$\text{}_{1-x}$p$\text{}_{x}$ and Band Structure Results from KKR-CPA
    Autorzy:
    Zach, R.
    Kaprzyk, S.
    Nizioł, S.
    Toboła, J.
    Bacmann, M.
    Fruchart, D.
    Wolfers, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956499.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    75.50.Cc
    Opis:
    The magnetoelastic phase transitions were observed in MnRhAs$\text{}_{1-x}$P$\text{}_{x}$ system (space group P6̅2m) by X-ray measurements (80 K < T < 300 K). For x = 0.33 and x = 0.4 contents an abrupt change of both lattice parameters and of the elementary cell volume at the metamagnetic transition was detected. The Korringa-Kohn-Rostoker electronic structure calculations performed for MnRhP compound show significant variations of densities of states at the Fermi level, while changing lattice data. The Korringa-Kohn- Rostoker-coherent potential approximation studies of disordered MnRhAs$\text{}_{1-x}$P$\text{}_{x}$ system (x=0.6, 0.8, 1.0) were done at the ferromagnetic region. From our calculations we observe moving of bands near E$\text{}_{F}$, while substituting with isoelectronic metalloid, likely as while changing the crystal data in MnRhP.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 471-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Transport Properties of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P in View of KKR-CPA Results
    Autorzy:
    Kaprzyk, S.
    Nizioł, S.
    Toboła, J.
    Zach, R.
    Bacmann, M.
    Fruchart, D.
    Wolfers, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1956503.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.20.Lp
    75.50.Cc
    Opis:
    We present results of the electronic structure study for the solid solution (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P (space group P6̅2m). The samples were synthesized for x=0.0 up to 0.15. From the electrical conductivity measurements on these materials, it was verified that resistivity increases with increasing temperature up to the Curie point T$\text{}_{C}$ and changes the slope at T$\text{}_{C}$ decreasing when temperature is raised above T$\text{}_{C}$. To get insight into the possible origin of such observations, we carried out the Korringa-Kohn-Rostoker-coherent potential approximation electronic structure calculations for (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P in the range of concentration x=0.0 up to 1.0. It was found that alloying with Ni in Fe$\text{}_{2}$ P causes vanishing of spin band splitting and non-rigid band behaving of electronic valence states near the Fermi level. The polarization factor for electrons at E$\text{}_{F}$ changes in (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P with increasing x, and interestingly, it reaches maximum at x=0.1, closely to the concentration (x=0.08), when the largest value of T$\text{}_{C}$ and a kink in temperature dependent resistivity were detected.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 475-478
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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