Magnetic and transport properties in Gd${}_{1-x}$Sr${}_x$CoO${}_3$ ($x$= 0.10-0.70)

Abstract

Magnetic and transport properties of polycrystalline Gd${}_{1-x}$Sr${}_x$CoO${}_3$ ($x$= 0.10-0.70) are investigated systemically. Cluster-glass magnetism for $x\le$ 0.45 and long-range ferromagnetic order in higher doping level are observed. Transport measurements indicate insulator-like behaviors for the samples with $x\le$ 0.30, and an insulator-metal (IM) transition around $x$ = 0.35, and metallic behaviors for higher $x$ samples. In contrast to La${}_{1-x}$Sr${}_x$COO${}_3$, the striking feature is that the system reenters insulator-like state for $x\ge$ 0.60, and the long-range ferromagnetic order and IM transition take place in samples with higher Sr content. It could be attributed to the enhancement of low-spin state stability for the trivalent Co ions due to the small radius of Gd${}^{3+}$ ion.

8 pages, 9 figures

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Cited by in corpus (1)

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