Magnetotransport of lanthanum doped RuSr 2 GdCu 2 O 8 – the role of gadolinium

M. Požek (), A. Dulčić, A. Hamzić, M. Basletić, E. Tafra, G. V.M. Williams and S. Krämer

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 57, issue 1, 1-7

Abstract: Strongly underdoped RuSr 1.9 La 0.1 GdCu 2 O 8 has been comprehensively studied by dc magnetization, microwave measurements, magnetoresistivity and Hall resistivity in fields up to 9 T and temperatures down to 1.75 K. Electron doping by La reduces the hole concentration in the CuO 2 planes and completely suppresses superconductivity. Microwave absorption, dc resistivity and ordinary Hall effect data indicate that the carrier concentration is reduced and a semiconductor-like temperature dependence is observed. Two magnetic ordering transitions are observed. The ruthenium sublattice orders antiferromagnetically at 155 K in low applied magnetic fields, and the gadolinium sublattice orders antiferromagnetically at 2.8 K. The magnetoresistivity in this compound exhibits a complicated temperature dependence due to the occurence of the two magnetic orders and spin fluctuations. It is shown that the ruthenium magnetism influences the conductivity in the RuO 2 layers while the gadolinium magnetism influences the conductivity in the CuO 2 layers. The magnetoresistivity is isotropic above 4 K, but it becomes anisotropic close to the gadolinium antiferromagnetic order temperature. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 74.72.-h Cuprate superconductors; 74.25.Fy Transport properties; 74.25.Ha Magnetic properties; 74.25.Nf Response to electromagnetic fields (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00149-8

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