High temperature magnetic ordering in La2RuO5

Details High temperature magnetic ordering in La2RuO5 High temperature magnetic ordering in La2RuO5

2005-04-19

arxiv.org/abs/cond-mat/0504489v1

Physics

Condensed Matter

Materials Science

16 pages, 6 figures, To be published in Solid State Communications

Scientific paper

10.1016/j.ssc.2005.04.016

Magnetic susceptibility, heat capacity and electrical resistivity measurements have been carried out on a new ruthenate, La2RuO5 (monoclinic, space group P21/c) which reveal that this compound is a magnetic semiconductor with a high magnetic ordering temperature of 170K. The entropy associated with the magnetic transition is 8.3 J/mole-K -close to that expected for the low spin (S=1) state of Ru4+ ions. The low temperatures specific heat coefficient g is found to be nearly zero consistent with the semiconducting nature of the compound. The magnetic ordering temperature of La2RuO5 is comparable to the highest known Curie temperature of another ruthenate, namely, metallic SrRuO3, and in both these compounds the nominal charge state of Ru is 4+.

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