Structure, transport and magnetic properties in La2xSr2-2xCo2xRu2-2xO6

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:323

Article

Murthy, P. S. R.¹  Priolkar, K. R.¹  Bhobe, P. A.²  Das, A.³  Sarode, P. R.¹  Nigam, A. K.² 

[1] Goa Univ, Dept Phys, Goa 403206, India

[2] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[3] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India

关键词: Double perovskites;    Magnetic compensation;    Neutron diffraction;   

DOI  :  10.1016/j.jmmm.2010.11.024

来源: Elsevier

【 摘 要 】

The perovskite solid solutions of the type La2xSr2-2xCo2xRu2-2xO6 with 0.25 <= x <= 0.75 have been investigated for their structural, magnetic and transport properties. All the compounds crystallize in double perovskite structure. The magnetization measurements indicate a complex magnetic ground state with strong competition between ferromagnetic and antiferromagnetic interactions. Resistivity of the compounds is in confirmation with hopping conduction behaviour though differences are noted especially for x=0.4 and 0.6. Most importantly, low field (50 Oe) magnetization measurements display negative magnetization during the zero field cooled cycle. X-ray photoelectron spectroscopy measurements indicate the presence of Co2+/Co3+ and Ru4+/Ru5+ redox couples in all compositions except x=0.5. Presence of magnetic ions like Ru4+ and Co3+ gives rise to additional ferromagnetic (Ru-rich) and antiferromagnetic sublattices and also explains the observed negative magnetization. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

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