Počet záznamů: 1

On the physical properties of Sr.sub.1-x./sub.Na.sub.x./sub.RuO.sub.3./sub. (x = 0 - 0.19)

  1. 1.
    0352057 - FZU-D 2011 RIV FR eng J - Článek v odborném periodiku
    Tomeš, P. - Knížek, Karel - Weidenkaff, A. - Hejtmánek, Jiří
    On the physical properties of Sr1-xNaxRuO3 (x = 0 - 0.19).
    Solid State Sciences. Roč. 12, č. 7 (2010), s. 1112-1120 ISSN 1293-2558
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: perovskite SrRuO3 * magnetism * heat capacity * weak localization
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 1.828, rok: 2010

    The metallic ferromagnetic perovskite SrRuO3 (TC~160K) belongs to the materials with strongly correlated electrons. Nonetheless a simple ferromagnetism associated with isotropic interactions of low spin Ru4+ ions local moments is too simple to explain the complex interplay between charge carriers and magnetic interactions. In order to probe the robustness of the metallic ferromagnetism against electron occupation of 4d Ru orbital we prepared and characterized polycrystalline Sr1-xNaxRuO3 (x=0.0–0.19) ceramics. The substitution of Sr2+ by Na1+ induces the decrease of the Curie temperature and spin-wave stiffness, which was determined independently from magnetic and specific heat data. On the other hand the effective paramagnetic moment remains essentially unchanged. All compounds are metallic in a sense of electrical resistivity and thermopower temperature dependence. The metallic nature of the samples is corroborated by Pauli paramagnetism and high Sommerfeld coefficient gamma.
    Trvalý link: http://hdl.handle.net/11104/0191655