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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effect of Chemical Disorder on Geometrically Frustrated Kagome Lattice
    Autorzy:
    Szymczak, H.
    Szymczak, R.
    Baran, M.
    Fink-Finowicki, J.
    Krzymanska, B.
    Aleshkevych, P.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812268.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.30.Gw
    75.30.Kz
    75.50.-
    Opis:
    This paper reviews recent progress in the studies of magnetic dilutions on magnetic properties of two frustrated systems: magnetoplumbite-like $SrGa_{12-x}Cr_xO_{19}$ and kagome staircase $Co_3V_2O_8$ doped with Mg ions. In the first group of compounds magnetic properties are determined by magnetic defects arising due to doping. In the case of kagome staircase compounds magnetic dilution suppresses effects of crystal field acting on magnetic ions. In particular, the dilution decreases magnetocrystalline anisotropy and anisotropy of magnetization.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 35-42
    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:
    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:
    Phase Transitions Induced in HoCo$\text{}_{3}$Ni$\text{}_{2}$ Single Crystals
    Autorzy:
    Zawadzki, J.
    Ballou, R.
    Gorges, B.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1928269.pdf
    Data publikacji:
    1993-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.Kz
    75.50.Gg
    75.60.Ej
    Opis:
    The magnetic studies of temperature and field induced phase transitions were performed on single crystals of HoCo$\text{}_{3}$Ni$\text{}_{2}$ compound. The rotational-type spin reorientation was found between T$\text{}_{SR1}$ = 160 K and T$\text{}_{SR2}$ = 200 K. In the vicinity of T$\text{}_{SR1}$ two different field induced transitions were observed: the first order moment reorientation type transition in the basal plane and the spin reorientation from the easy plane to the c-axis with simultaneous increase in spontaneous magnetization. The intersublattice molecular field coefficient as well as the magnetization anisotropy of Ho sublattice were determined. The observed magnetic behaviour was analysed within the framework of the spin-reorientation model, taking into account the change of the intrinsic states of rare-earth ions caused by their huge anisotropy energy. The thermal variation of the anisotropy constants of the studied compound is also presented.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 2; 209-218
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Glass Transition in the $RCoGaO_{4}$ (R=Lu, Yb) Layered Cobaltites
    Autorzy:
    Radelytskyi, I.
    Szymczak, R.
    Dabkowska, H.
    Noad, H.
    Aleshkevych, P.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368512.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.30.Gw
    75.30.Kz
    75.40.-s
    75.50.Lk
    Opis:
    The frequency, temperature, and the dc and ac dependences of the magnetic susceptibility of the $YbCoGaO_{4}$ and $LuCoGaO_{4}$ single crystals are investigated. The $YbCoGaO_{4}$ behaves like an Ising spin glass with a strong uniaxial anisotropy. In contrast $LuCoGaO_{4}$ is Heisenberg-like spin glass. Dynamical scaling reveals a three dimensional phase transition near Tg and yields critical exponent values between those of Heisenberg- and Ising-like systems.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 230-231
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field-Induced Magnetic Order in Frustrated $TbBaCo_4O_7$ Single Crystals
    Autorzy:
    Szymczak, R.
    Bludov, A.
    Gnatchenko, S.
    Barilo, S.
    Jezierski, A.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536830.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.30.Gw
    75.30.Kz
    75.60.Ej
    75.50.Dd
    Opis:
    We present results of dc magnetic susceptibility measurements in $TbBaCo_4O_7$ single crystals performed at temperatures in the range 2-300 K and in magnetic fields up to 55 kOe. The results obtained seem to suggest that the ground state of $TbBaCo_4O_7$ is composed of coexisting long-range ordered and short-range ordered clusters and is transformed into a magnetically ordered weak ferromagnetic phase by application high magnetic field along c-axis.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 299-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnet with Ferromagnetic Nearest-Neighbor and Antiferromagnetic Next-Nearest-Neighbor Exchange Interactions
    Autorzy:
    Szymczak, R.
    Szymczak, H.
    Kamieniarz, G.
    Szukowski, G.
    Jaśniewicz-Pacer, K.
    Florek, W.
    Maltsev, V.
    Babonas, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808031.pdf
    Data publikacji:
    2009-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.50.Ee
    75.30.Gw
    75.30.Et
    75.30.Kz
    Opis:
    Magnetic properties of $Pb[Cu(SO_4)(OH)_2]$ (linarite) natural single crystals were studied by magnetization and specific heat measurements. The angular dependences of magnetization were revealed which correlated with the regularities of the crystal structure. At about 2.8 K this quasi-one-dimensional Heisenberg system undergoes a phase transition to the long-range antiferromagnetic order with antiparallel magnetic moments aligned probably along the b-axis. The antiferromagnetic order is evidenced by the metamagnetic transition and pronounced λ-type anomaly at $T_N$ in the specific heat. Using phenomenological modeling based on a quantum transfer-matrix method, we argue that at higher temperatures linarite is a quasi-one-dimensional system with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange interactions.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 5; 925-930
    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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