Giant nonlinear conduction and thyristor-like negative derivative resistance in BaIrO3 single crystals

Abstract

We synthesized single-crystalline samples of monoclinic BaIrO3 using a molten flux method, and measured their magnetization, resistivity, Seebeck coefficient and nonlinear voltage-current characteristics. The magnetization rapidly increases below a ferromagnetic transition temperature TC of 180 K, where the resistivity concomitantly shows a hump-type anomaly, followed by a sharp increase below 30 K. The Seebeck coefficient suddenly increases below TC, and shows linear temperature dependence below 50 K. A most striking feature of this compound is that the anomalously giant nonlinear conduction is observed below 30 K, where a small current density of 20 A/cm2 dramatically suppresses the sharp increase in resistivity to induce a metallic conduction down to 4 K.

10 pages, 4 figures Submitted to Physical Review Letters

References in corpus (11)

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• Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+x
• Quantum criticality
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• Thermoelectric Behaviour Near Magnetic Quantum Critical Point
• High-temperature weak ferromagnetism on the verge of a metallic state: Impact of dilute Sr-doping on BaIrO3
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• Quantum critical point in a periodic Anderson model

Cited by in corpus (5)

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• Superexchange interactions between spin-orbit-coupled $j\approx 1/2$ ions in oxides with face-sharing ligand octahedra
• Mott insulator-to-metal transition in yttrium-doped CaIrO3
• Spectroscopic signature of trimer Mott insulator and charge disproportionation in BaIrO${}_3$
• Anomalous CDW ground state in Cu${}_2$Se: a wave-like fluctuation of $dc$ I-V curve near 50 K