Abstract
We synthesized single-crystalline samples of monoclinic using a molten flux method, and measured their magnetization, resistivity, Seebeck coefficient, and nonlinear voltage-current characteristics. The magnetization rapidly increases below the ferromagnetic transition temperature of , where the resistivity concomitantly shows a hump-type anomaly, followed by a sharp increase below . The Seebeck coefficient suddenly increases below , and shows linear temperature dependence below . A most striking feature of this compound is that the anomalously giant nonlinear conduction is observed below , where a small current density of dramatically suppresses the sharp increase in resistivity to induce a metallic conduction down to .
- Received 5 September 2005
DOI:https://doi.org/10.1103/PhysRevB.73.195106
©2006 American Physical Society