High temperature magnetic ordering in La2RuO5

TL;DR

This study reports that La2RuO5 is a monoclinic magnetic semiconductor with a high magnetic ordering temperature of 170K, exhibiting properties similar to metallic ruthenates but with semiconducting behavior.

Contribution

The paper presents the discovery and characterization of La2RuO5 as a new magnetic semiconductor with a high ordering temperature, expanding understanding of ruthenate materials.

Findings

La2RuO5 is a magnetic semiconductor with T_N = 170K.

Magnetic entropy suggests low spin (S=1) Ru4+ ions.

The compound exhibits near-zero specific heat coefficient, confirming semiconducting nature.

Abstract

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+.