Microstructure and metal-insulator transition in single crystalline KMo4O6

AUTOR(ES)

Andrade, Margareth, Maffei, Mariana Lanzoni, Alves, Leandro Marcos Salgado, Santos, Carlos Alberto Moreira dos, Ferreira, Bento, Sartori, Antonio Fernando

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

11/10/2012

RESUMO

High quality KMo4O6 single crystals with tetragonal structure (space group P4/mbm) have been prepared by fused salt electrolysis. The crystals were studied by scanning electron microscopy (SEM), X-ray diffractometry, electrical resistivity, and magnetization measurements. X-ray powder diffraction patterns and SEM have given some information on the growth of single crystals. Electrical resistivity as a function of temperature shows that the KMo4O6 compound is a bad metal with resistivity change of approximately 30% in the temperature range from 2 to 300K. A metal-insulator transition (MIT), observed at approximately 110K, has been also confirmed for this material. Magnetization as a function of temperature agrees with previous report, however a magnetic ordering has been observed in M(H) curves in the whole temperature range.

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