Paramagnetic and spin-glass properties of pyrochlore-like oxides Ln2Mn2/3Mo4/3O7 (Ln=Sm, Gd, Tb, or Y) |
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Authors: | A V Korolev and G V Bazuev |
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Institution: | (1) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620219, Russia;(2) Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg, 620219, Russia |
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Abstract: | The magnetic properties of complex oxides Ln
2Mn2/3Mo4/3O7 (Ln=Sm, Gd, Tb, or Y) with a pyrochlore-type structure are studied in the temperature range 2–300 K. For all compounds in the
paramagnetic state, the temperature dependence of the magnetic susceptibility is described by a generalized Curie-Weiss law
with a temperature-independent component of ∼10−6 cm3/g and with a Weiss constant Θ<0 and |Θ|<16 K. At low temperatures (T<10–12 K), the compounds have spin-glass properties; they exhibit magnetic and temperature hysteresis and the typical dependences
of the imaginary and real parts of the dynamic magnetic susceptibility on temperature and the frequency of an ac magnetic
field in a wide range of magnetization relaxation times. The data obtained suggest that d electrons are responsible for the formation of frustrated exchange interactions in the compounds and that 4f electrons in the compounds with Sm or Tb provide strong magnetic-anisotropy effects.
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Translated from Fizika Tverdogo Tela, Vol. 46, No. 2, 2004, pp. 287–295.
Original Russian Text Copyright ? 2004 by Korolev, Bazuev. |
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