Structural, transport and magnetic properties of

✍ Scribed by S. Savitha Pillai; P.N. Santhosh; P. John Thomas; F. Tuna; K.G. Suresh

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 641 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.05.026

✦ Synopsis

The double perovskite, Sr 2 RuTiO 6 has been studied by X-ray powder diffraction, magnetizations and magnetoresistance techniques. Rietveld analysis of the X-ray diffraction shows that the sample crystallizes in tetragonal structure with space group I4/mcm and there is no indication of long range Ru/Ti cation ordering. The magnetic studies point towards the existence of magnetic polarons in the paramagnetic state with a weak ferromagnetic transition at 145 K. The temperature dependent magnetoresistance studies reveal an unusual cross over from positive to negative magnetoresistance at low temperature (∼15 K). The complex magnetotransport properties of Sr 2 RuTiO 6 arise from the competing ferromagnetic and antiferromagnetic superexchange interactions between Ru ions via Ti/O ions, initiated by the B-site cation disorder.