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|標題:||Ferromagnetism in CaMn1-xIrxO3||作者:||Mizusaki, S.
|關鍵字:||density-wave formation;crystal-structures;weak ferromagnetism;magnetic-properties;electrical-properties;perovskites;bairo3;phase;transition;sr2iro4||Project:||Journal of Physics-Condensed Matter||期刊/報告no：:||Journal of Physics-Condensed Matter, Volume 20, Issue 23.||摘要:||
The crystallographic, magnetic, and electric properties of CaMn1-xIrxO3 (0 <= x <= 0.6) were investigated. The lattice constants increase with increasing content of Ir. Specimens of 0.05 <= x <= 0.2 show antiferromagnetic behavior; however, ferromagnetism is observed for specimens of 0.3 <= x <= 0.6. T-N decreases as the Ir content increases. T-N is superseded by T-C without passing 0 K and TC continues to increase in the ferromagnetic composition range. The effective moment mu(eff) decreases as the Ir content increases. The Weiss temperature is negative for small x; however, it continues to increase while changing its sign at about x = 0.3. The results were explained by assuming a mixed valence state of Mn3+, Mn4+, Ir4+, and Ir5+ ions. The composition dependence of mu(eff) could be explained qualitatively using the ion fractions estimated from the Ir content dependence of the unit cell volume. Experimental results suggest the coexistence of antiferromagnetic and ferromagnetic phases. When the volume fraction of the ferromagnetic phase dominates that of the antiferromagnetic phase, the system seems to show ferromagnetism.
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