Autor: Reiffers, M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Study of Magnetic Contribution to the Heat Capacity of $YbCu_4Ni$
Autorzy:: Čurlik, I.
Reiffers, M.
Giovannini, M.
Tematy:: 71.27.+a
75.30.-m
75.30.Mb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1419635.pdf Link otwiera się w nowym oknie
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 $YbCu_4Ni$.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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.
Tematy:: 71.27.+a
75.30.-m
75.30.Mb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1534404.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Approximation of Electrical and Magneto Transport Properties of LSMO Thin Films
Autorzy:: Štrbík, V.
Reiffers, M.
Chromik, Š.
Španková, M.
Tematy:: 73.43.Qt
75.47.-m
75.70.-i; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1368199.pdf Link otwiera się w nowym oknie
Opis:: We have used a three term polynomial expression to approximate electrical and magneto transport properties of epitaxial $La_{0.67}Sr_{0.33}MnO_{3}$ (LSMO) thin films in wide temperature range (2-350 K) and in magnetic field up to 9 T. The first term is determined by a low temperature (T<20 K) residual resistivity $ρ_{0}$ and this term is magnetic field independent. The second term describes the electron-electron scattering in LSMO, it shows ~ $T^{2}$ dependence of resistivity up to temperature about 160 K and depends only weakly on magnetic field. The third term, proportional to ~ $T^{4.5}$ dependence, describes a significant increase of resistivity in temperature range 160-350 K and due to its sensitivity to applied magnetic field it is possible to approximate temperature dependence of magnetorestivity below 350 K.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Low Temperature Magnetic Ordering in NdAgAl₃
Autorzy:: Nallamuthu, S.
Džubinská, A.
Reiffers, M.
Nagalakshmi, R.
Tematy:: 71.70.Ch
65.40.Ba; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1032835.pdf Link otwiera się w nowym oknie
Opis:: We present the detailed study of magnetic, thermodynamic, and transport properties of polycrystalline NdAgAl₃. The compound crystallizes in BaNiSn₃-type tetragonal structure with the space group I4mm. Magnetic, heat capacity and transport measurements indicate the possible antiferromagnetic nature of the ordering below 2 K. The compound shows the Schottky anomaly in heat capacity data. Magnetoresistance is negative at low temperature.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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.
Tematy:: 71.27.+a
75.30.-m
75.30.Mb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398287.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Crystal Structure and Magnetic Properties of new Eu-Pd-Sn Compounds
Autorzy:: Čurlík, I.
Gastaldo, F.
Giovannini, M.
Strydom, A.
Reiffers, M.
Tematy:: 71.27.+a
75.30.Mb
75.30.-m; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1032628.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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.
Tematy:: 65.40.Ba
71.20.Eh
71.27.+a; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1810399.pdf Link otwiera się w nowym oknie
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 $\text{mol}^{-1} K^{-2}$.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Heat Capacity Studies of $NdNi_4Si$ Compound
Autorzy:: Falkowski, M.
Reiffers, M.
Zapotoková, M.
Kowalczyk, A.
Toliński, T.
Gažo, E.
Tematy:: 65.40.De
65.40.gd
71.20.Eh
71.70.-d; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1810401.pdf Link otwiera się w nowym oknie
Opis:: The study of the heat capacity of the intermetallic compound $NdNi_{4}Si$ including the effect of the magnetic field is reported. This compound crystallizes in the hexagonal $CaCu_5$-type structure, space group P6/mmm. $NdNi_{4}Si$ is ferromagnetic with $T_C$ = 8 K and the saturation magnetic moment of 1.5 $μ_{B}$/f.u. at 4.2 K (in H = 9 T). The heat capacity was analyzed considering the electronic contribution, the Schottky anomaly, and the lattice contributions in the frames of the Debye model. The scheme of the energy levels created by the crystal electric field split is determined from the Schottky contribution to the specific heat. $NdNi_{4}Si$ was characterized by the electronic heat capacity coefficient γ = 85 mJ/(mol $K^2$) and the Debye temperature $Θp_D$ = 325 K.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

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.
Tematy:: 71.27.+a
75.30.-m
75.30.Mb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1534605.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Transport and Magnetic Properties of $YbCu_4Ni$
Autorzy:: Čurlik, I.
Mát'ošová, Š.
Il'kovič, S.
Reiffers, M.
Giovannini, M.
Tematy:: 71.27.+a
75.30.-m
75.30.Mb; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1419636.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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