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Wyszukujesz frazę "Reiffers, M." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Study of Magnetic Contribution to the Heat Capacity of $YbCu_4Ni$
    Autorzy:
    Čurlik, I.
    Reiffers, M.
    Giovannini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419635.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.-m
    75.30.Mb
    Opis:
    An investigation of the magnetic heat capacity of the heavy-fermion compound $YbCu_4Ni$ up to 0.4 K is presented. The novel compound $LuCu_4Ni,$ isotypic with $YbCu_4Ni$ has been synthesized and characterized, and its heat capacity was measured in order to subtract the lattice contribution from the previously measured heat capacity data of $YbCu_4Ni$.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 3-5
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point Contact Properties of $R_3Pd_{20}X_6$ (R = La, Ce; X = Si, Ge) Cage Compounds
    Autorzy:
    Čurlik, I.
    Strydom, A.
    Reiffers, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534404.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.-m
    75.30.Mb
    Opis:
    Point-contact spectroscopy measurements have been performed on the $R_3Pd_{20}X_6$ (R = La, Ce; X = Si, Ge) cage compounds. In case of La the characteristic phonon energies have been obtained in agreement with that of the Raman scattering. In $Ce_3Pd_{20}Si_6$ we have observed asymmetric behaviour of dV/dI(V) dependences which was observed in non-Fermi liquid compound. In $Ce_3Pd_{20}Ge_6$ we have observed maxima at crystalline electric field energies, influenced by magnetic field. This is connected with quadrupolar ordering transition.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 907-909
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Heat Capacity Study of the new $Gd_{1-x}Ce_xNi_5$ Series
    Autorzy:
    Dzubinska, A.
    Reiffers, M.
    Espeso, J.
    Rodríguez Fernández, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398287.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.-m
    75.30.Mb
    Opis:
    We have prepared a new system of $Gd_{1-x}Ce_xNi_5$ polycrystalline samples with concentrations x =0, 0.2, 0.5, and 0.8 in order to study the influence of different rare-earths substitutions on the ground state connected with spin fluctuations. GdNi₅ is a ferromagnetic compound with $T_{C}=31.8 K$ and CeNi₅ is a well-known spin fluctuation compound without magnetic ordering down to the lowest temperatures. X-ray diffraction study confirms the hexagonal crystal structure and the single phase samples. Magnetic properties (M(T),M(B)) show that an increasing content of Ce depresses the transition temperature, $T_{C}$, down to 4.9 K for x=0.8. The heat capacity measurements confirmed these results.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 997-999
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Structure and Magnetic Properties of new Eu-Pd-Sn Compounds
    Autorzy:
    Čurlík, I.
    Gastaldo, F.
    Giovannini, M.
    Strydom, A.
    Reiffers, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032628.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.Mb
    75.30.-m
    Opis:
    We report on the synthesis, crystal structure determination, and magnetic susceptibility measurements of Eu₃Pd₂Sn₂, EuPd₂Sn₄, and EuPdSn₂. For all three compounds a divalent state of Eu ions was obtained from the fitting of the magnetic susceptibilities. At low temperatures Eu₃Pd₂Sn₂, EuPd₂Sn₄, and EuPdSn₂ order magnetically at 23, 12, and 13 K, respectively.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1003-1005
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Capacity of Heavy Fermion Compound $CeCu_4Ga$ in High Magnetic Fields
    Autorzy:
    Kowalczyk, A.
    Toliński, T.
    Reiffers, M.
    Zapotoková, M.
    Falkowski, M.
    Gažo, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810399.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.Ba
    71.20.Eh
    71.27.+a
    Opis:
    The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline $CeCu_{4}Ga$ are presented. Magnetic ordering was not observed down to 2 K. For temperature T < 200 K a Curie-Weiss behavior is observable giving an effective magnetic moment $μ_\text{eff}$ =2.53 $μ_{B}$/f.u. The experimental value of $μ_\text{eff}$ is close to the calculated one for a free $Ce^{3+}$ ion ($μ_\text{eff}$ = 2.54 $μ_{B}$/f.u.), thus indicating the presence of well localized magnetic moments carried by the stable $Ce^{3+}$ ions. At low temperatures the electronic heat capacity coefficient value depends strongly on the temperature range used for the extrapolation and applied magnetic field. We observe a typical heavy fermion behavior with γ value of about 380 mJ $\text{mol}^{-1} K^{-2}$ obtained from extrapolation to T = 0 K of the temperature range above 7 K. However, extrapolation of the lowest temperatures range yields the γ value of 3.3 J $\text{mol}^{-1} K^{-2}$.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 123-125
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strong Electronic Correlations in a New Yb-Based Compound: $YbCu_4Ni$
    Autorzy:
    Čurlik, I.
    Reiffers, M.
    Giovannini, M.
    Gažo, E.
    Šebek, J.
    Šantavá, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534605.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.-m
    75.30.Mb
    Opis:
    Heat capacity measurements performed on the new ternary compound $YbCu_4Ni$ indicate for this compound strong electronic correlations with possible antiferromagnetic phase transition below 0.5 K. Susceptibility and magnetisation measurements above 2 K show no magnetic ordering.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 919-921
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport and Magnetic Properties of $YbCu_4Ni$
    Autorzy:
    Čurlik, I.
    Mát'ošová, Š.
    Il'kovič, S.
    Reiffers, M.
    Giovannini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419636.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.-m
    75.30.Mb
    Opis:
    The results on the influence of magnetic field on the electrical resistivity ρ(T) of the heavy fermion $YbCu_4Ni$ in the temperature range 0.4-300 K are presented. We have observed a Kondo-like behaviour below 10 K with a minimum in ρ(T) at about 60 K. An applied magnetic field depresses this behaviour, and a maximum in ρ(T) appears similarly to the maximum observed in heat capacity. The observed electrical magnetoresistance shows negative values in all applied magnetic fields and with increasing temperature its absolute magnitude increases. Moreover, we extended our previous susceptibility measurements up to high temperatures of 1000 K, in order to study possible mixed valence behaviour, which however was not observed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 6-10
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Properties of the $Ce_{1-x}La_{x}NiAl_4$
    Autorzy:
    Toliński, T.
    Kowalczyk, A.
    Reiffers, M.
    Šebek, J.
    Šantavá, E.
    Curlik, I.
    Ilkovič, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534742.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    65.40.Ba
    75.30.Mb
    Opis:
    Measurements of the heat capacity in ultralow temperatures (down to 350 mK) have been carried out for $Ce_{1-x}La_{x}NiAl_4$. The paramagnetic behavior above about 30 K can be well described by the Curie-Weiss magnetic susceptibility. The undoped CeNiAl_4 compound is a known heavy fermion system with a large electronic specific heat coefficient (γ = 0.5 J $mol^{-1} K^{-2}$) and the Kondo temperature in the range 30-80 K. In the case of the $Ce_{0.8}La_{0.2}NiAl_4$ and $Ce_{0.6}La_{0.4}NiAl_4$ compounds a peak in C/T appears below 2 K, which is strongly damped by the magnetic field. It is probably connected with the Kondo and/or magnetic interactions and the electronic specific heat coefficient is 0.19 J $mol^{-1} K^{-2}$ (0.43 J $mol^{-1} K^{-2}$) for x = 0.2 (x = 0.4) at T → 0. The value determined above the peak, at temperature for which the magnetic field starts to decrease γ ( ≈ 3 K), is about 0.5 J $mol^{-1} K^{-2}$ and the effect of the magnetic field can be well analyzed in frames of the single-ion Kondo model.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 933-935
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and physical properties of the new stannide Yb₃Pd₄Sn₁₃
    Autorzy:
    Gastaldo, F.
    Giovannini, M.
    Strydom, A.
    Djoumessi, R.
    Čurlík, I.
    Reiffers, M.
    Solokha, P.
    Saccone, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050753.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    74.25.F-
    74.10.+v
    Opis:
    Among the new discovered intermetallics in the Yb-Pd-Sn system, the cubic phase Yb₃Pd₄Sn₁₃, with a lattice parameter of 0.9743(5) nm, emerges as a new member of the R₃T₄Sn₁₃ family (R = rare earth element, T = transition metal) crystallizing in the Yb₃Rh₄Sn₁₃-structure type. The effective magnetic moment μ_{eff}=1.84 μ_{B}/Yb is strongly reduced. Moreover, measurements of magnetic properties, specific heat and resistivity indicate superconductivity below 2.4 K. This compound is found to exhibit a strongly enhanced electronic specific heat at low temperature from which we infer a possible low-lying magnetic phase transition or other source of magnetic entropy.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1006-1008
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pressure Effect on Yb-Based Strongly Correlated Electron Systems
    Autorzy:
    Mito, T.
    Otani, M.
    Nakamura, M.
    Koyama, T.
    Wada, S.
    Kotegawa, H.
    Kobayashi, T.
    Idzikowski, B.
    Reiffers, M.
    Sarrao, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810284.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.27.+a
    75.30.Kz
    75.30.Mb
    76.60.-k
    Opis:
    We studied pressure effects on $YbCu_5$ and $YbInCu_4$, good examples of the Yb-based compounds to investigate the nonmagnetic-magnetic transition in Yb-based strongly correlated electron systems. With increasing pressure, the low-temperature Fermi liquid state of $YbCu_5$ is gradually suppressed, suggesting the second-order like nonmagnetic-magnetic transition around the pressure of 5-6 GPa. On the other hand, in $YbInCu_4$ which has a pressure-induced magnetic ordered ground state above $P_C$=2.45 GPa, both high-temperature paramagnetic and low-temperature intermediate valence phases are insensitive to pressure. Our results confirm the first-order nature of the transition between the intermediate valence and magnetic ordered phases with pressure.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 47-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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