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    Wyświetlanie 1-7 z 7
    Tytuł:
    Magnetic Properties of the Nanocrystalline $DyMnO_{3}$ Compound
    Autorzy:
    Dyakonov, V.
    Szytuła, A.
    Baran, S.
    Kravchenko, Z.
    Zubov, E.
    Iessenchuk, O.
    Bazela, W.
    Dul, M.
    Zarzycki, A.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538453.pdf
    Data publikacji:
    2010-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.47.Lx
    75.50.Ee
    75.75.-c
    Opis:
    We report on the X-ray powder diffraction and magnetic measurements of the polycrystalline and the two nanocrystalline samples of $DyMnO_{3}$ compound synthesized at temperatures of 800 and 850°C. All samples at room temperature crystallize in the orthorhombic crystal structure (space group Pnma). The crystal structure parameters determined change only slightly with preparation methods but the average grains size of the nanoparticles determined from X-ray data increases significantly with increasing annealing temperature. Temperature dependence of the magnetic susceptibility indicates the antiferromagnetic order in Dy sublattice at low temperatures.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 4; 607-610
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Phase Transitions in Pure and Cobalt-Doped Geometrically Frustrated Ni$\text{}_{3}$V$\text{}_{2}$O$\text{}_{8}$ Single Crystals
    Autorzy:
    Szymczak, H.
    Baran, M.
    Szymczak, R.
    Barilo, S. N.
    Bychkov, G. L.
    Shiryaev, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047217.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.Kz
    75.40.Cx
    75.50.-y
    Opis:
    The results of magnetic measurements performed on geometrically frustrated Ni$\text{}_{3}$V$\text{}_{2}$O$\text{}_{8}$ and Ni$\text{}_{3(1-x)}$Co$\text{}_{3x}$V$\text{}_{2}$O$\text{}_{8}$ single crystals with x=0.03 are presented. It was found that Co doping did not change considerably the magnetic H-T phase diagram. Although no spin-glass effects were observed, nevertheless, a strong effect of 3 at% cobalt doping was evidenced. The main effect of Co-doping concerns the direction of the antiferromagnetic vector, which for Ni$\text{}_{3}$V$\text{}_{2}$O$\text{}_{8}$ appears along the $a$ axis, while for only slightly Co doped crystals - along the $c$ axis. This switching of direction results from distinct changes of the magnetocrystalline anisotropy due to the presence of Co$\text{}^{2+}$ ions strongly coupled to the kagome lattice. The disorder introduced by doping has practically no effect on the magnitude of the isotropic exchange interactions. At the same time the doping suppresses the Dzyaloshinskii-Moriya exchange interactions due to the change of direction of the antiferromagnetic vector.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 71-77
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Spin-Ladders (A$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$ (CuO$\text{}_{2}$)$\text{}_{n}$
    Autorzy:
    Baran, M.
    Szymczak, H.
    Szymczak, R.
    Dyeyev, S.
    Leonyuk, L.
    Babonas, G.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013220.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.30.Gw
    75.45.+j
    75.90.+w
    Opis:
    Magnetization M(T) and M(H) data of single crystals of the S=1/2 quasi-one-dimensional system (A$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$(CuO$\text{}_{2}$)$\text{}_{n}$ with various A-site constituents are compared. The studied orthorhombic, incommensurate crystals are characterized by m/n=5/7,7/10, and 9/13. The role of rare-earth ions located in A-sites is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 571-574
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Transport and Magnetic Properties of La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ MnO$\text{}_{3}$ Thin Films
    Autorzy:
    Baran, M.
    Berkowski, M.
    Fink-Finowicki, J.
    Lewandowski, S. J.
    Szymczak, H.
    Szymczak, R.
    Khartchev, S. I.
    Medvedev, Yu. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037109.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    72.15.Gd
    75.70.Pa
    Opis:
    The magnetic and transport properties of epitaxial La$\text{}_{2}\text{}_{/}\text{}_{3}$ Pb$\text{}_{1}\text{}_{/}\text{}_{3}$ CuO$\text{}_{3}$ thin films deposited on SrLaGaO$\text{}_{4}$ substrate using dc magnetron sputtering technique are reported. The giant magnetoresistance effect (of about 50% at magnetic field of 1 T) was observed near the Curie temperature. Several mechanisms responsible for temperature dependence of resistivity are discussed. The effect of annealing was studied. It shifted the Curie temperature to the lower value, probably, because of the loss of oxygen.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 115-120
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of EuBaCo$\text{}_{2}$O$\text{}_{5.5}$ Single Crystals
    Autorzy:
    Baran, M.
    Barilo, S. N.
    Bychkov, G. L.
    Gatalskaya, V. I.
    Kurochkin, L. A.
    Shiryaev, S. V.
    Szymczak, R.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037131.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.50.Dd
    75.30.Gw
    75.30.Kz
    Opis:
    The static magnetization of the EuBaCo$\text{}_{2}$O$\text{}_{5.5}$ single crystals was measured from helium to room temperatures for two configurations of the applied field: parallel and perpendicular to the c-axis. The compound is antiferromagnetic from helium temperature to about 210 K. In low temperature region (below 45 K) the antiferromagnetism coexists with a spin-glass-like state. The metamagnetic field-induced phase transition was observed in the antiferromagnetic phase for magnetic field applied perpendicular to the c-axis. The spontaneous phase transition from antiferromagnetic to weak ferromagnetic phase was established to be of the first order. This transition is accompanied by the appearance of the intermediate state. The weak ferromagnetic phase exists up to T$\text{}_{c}$=240 K.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 209-214
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ellipsometric Studies of NdMnO$\text{}_{3}$ Single Crystals
    Autorzy:
    Babonas, G. J.
    Reza, A.
    Szymczak, R.
    Baran, M.
    Shiryaev, S.
    Fink-Finowicki, J.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037130.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    78.20.Ci
    Opis:
    Ellipsometric studies of NdMnO$\text{}_{3}$ single crystals of orthorhombic symmetry were carried out in the spectral range 0.5-5.0 eV. Experimental data, which were obtained on the (001)$\text{}_{pc}$-type planes of pseudo-cubic system, were analyzed in the model of biaxial crystal. For the first time, three componentsε$\text{}_{x}$,ε$\text{}_{y}$,ε$\text{}_{z}$ of the effective dielectric function for manganites of orthorhombic symmetry were determined. From ellipsometric data, the spectra of optical conductivity and loss function were also calculated and considered. The fine structure of the spectra and optical anisotropy was the basis for discussion of the microscopic origin of the optical transitions responsible for the optical features. The electronic excitations due to dipole-forbidden spin-allowed transitions of the d-d-type in Mn-ions, f-f-type in Nd-ions and charge-transfer 2p(O)-3d(Mn) transitions were taken into account. The data for NdMnO$\text{}_{3}$ were compared with those obtained for other related undoped and doped single crystals of perovskite-type structure, LaMnO$\text{}_{3}$, (LaBa)(MnCo)O$\text{}_{3}$ and (LaCa)CoO$\text{}_{3}$.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 197-208
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural, Magnetic and Transport Properties οf $NdBaCo_{2}O_{5+x}$ Thin Films Deposited by Magnetron Sputtering
    Autorzy:
    Vlakhov, E.
    Szymczak, R.
    Baran, M.
    Piotrowski, K.
    Szewczyk, A.
    Paszkowicz, W.
    Lobanovskii, L.
    Matyajasik, S.
    Nenkov, K.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810303.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ak
    64.75.St
    64.75.Lm
    Opis:
    For the first time, thin films of $NdBaCo_{2}O_{5+x}$ were deposited by RF magnetron sputtering on different substrates. The films deposited on $SrLaAlO_4(001)$ substrates exhibited highly textured structure with c-axis directed out-of-plane. Magnetic measurements M vs. T of three $NdBaCo_{2}O_{5+x}$/$SrLaAlO_4(001)$ films revealed successively paramagnetic-ferromagnetic-antiferromagnetic transitions with decrease in temperature. Their paramagnetic Curie-Weiss temperatures were estimated to be in the range of $T_{C}$ =100-116 K. Resistivity of the cobaltite thin film exhibited insulating behavior and the best fit was found for the variable range hopping mechanism.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 89-91
    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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