Magnetic and electric properties of Sr2FeMoO6

S¨¢NCHEZ, RODOLFO D.; NIEBIESKIKWIAT, DARIO; CANEIRO, ALBERTO; MORALES, LILIANA; VASQUEZ MANSILLA, MARCELO; RIVADULLA, FRAN; HUESO, L. E.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Elsevier Science

Año: 2001 vol. 226 p. 895 - 897

0304-8853

We present electrical resistivity (¦Ñ) and magnetic susceptibility (¦Ö) data of the Sr2FeMoO6 double perovskite. We found that the as prepared sample shows semiconducting ¦Ñ(T) in the whole temperature range and a magnetoresistance behavior typical of electron tunneling at the grain boundaries (gb). When the oxygen of the gb is removed ¦Ñ drops one order of magnitude. Below the magnetic ordering temperature TC¡Ö405K and above 590 K this sample is metallic (d¦Ñ/dT>0), while for TC<T<590K we observe a weak localization. The ¦Ö(T) data follow the Curie¨CWeiss law only in a short temperature range above TC.