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

Author

Listed:
  • M. Požek
  • A. Dulčić
  • A. Hamzić
  • M. Basletić
  • E. Tafra
  • G. V.M. Williams
  • S. Krämer

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

Suggested Citation

  • M. Požek & A. Dulčić & A. Hamzić & M. Basletić & E. Tafra & G. V.M. Williams & S. Krämer, 2007. "Magnetotransport of lanthanum doped RuSr 2 GdCu 2 O 8 – the role of gadolinium," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 57(1), pages 1-7, May.
    • Handle: RePEc:spr:eurphb:v:57:y:2007:i:1:p:1-7
    DOI: 10.1140/epjb/e2007-00149-8
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