This article is cited in 10 papers

CONDENSED MATTER

Dielectric and magnetic properties of the multiferroic Tb_(1−x)Bi_xMnO₃: Electric dipole glass and self-organization of charge carriers

E. I. Golovenchits, V. A. Sanina

Ioffe Physico-Technical Institute, Russian Academy of Sciences

Abstract: Single crystals of the new multiferroic Tb_(1−x)Bi_xMnO₃ have been grown and studied. A semiconductor compound with x = 0.05 is investigated in most detail. At temperatures T ≥ 165 K, the electric dipole glass state is realized in the crystal. Localized charge carriers form conducting drops of electrons and holes, which are located predominantly in thin layers at the boundaries of polar domains. When drops escape as the temperature increases, jumps in conductance and capacitance are observed. The state of drops is controlled by low bias voltage. The long-range magnetic order arises at temperatures T ≤ 90 K. Negative magnetoresistance is observed at temperatures of the existence of localized charge carriers.

PACS: 75.47.Lx, 76.50.+g, 77.80.-e

Received: 13.04.2005

 English version: Journal of Experimental and Theoretical Physics Letters, 2005, 81:10, 509–513

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