Magnetotransport of lanthanum doped RuSr<Subscript>2</Subscript>GdCu<Subscript>2</Subscript>O<Subscript>8</Subscript> – the role of gadolinium
Strongly underdoped RuSr<Subscript>1.9</Subscript>La<Subscript>0.1</Subscript>GdCu<Subscript>2 </Subscript>O<Subscript>8</Subscript> 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<Subscript>2</Subscript> 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<Subscript>2</Subscript> layers while the gadolinium magnetism influences the conductivity in the CuO<Subscript>2</Subscript> 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
Year of publication: |
2007
|
---|---|
Authors: | Požek, M. ; Dulčić, A. ; Hamzić, A. ; Basletić, M. ; Tafra, E. ; Williams, G. V.M. ; Krämer, S. |
Published in: |
The European Physical Journal B - Condensed Matter and Complex Systems. - Springer. - Vol. 57.2007, 1, p. 1-7
|
Publisher: |
Springer |
Subject: | 74.72.-h Cuprate superconductors | 74.25.Fy Transport properties | 74.25.Ha Magnetic properties | 74.25.Nf Response to electromagnetic fields |
Saved in:
Online Resource
Saved in favorites
Similar items by subject
-
Physical property characterization of bulk MgB<Subscript>2</Subscript> superconductor
Awana, V. P.S., (2008)
-
Khajehnezhad, A., (2008)
-
Magnetohydrodynamic properties of incompressible Meissner fluids
Maeyens, A., (2007)
- More ...
Similar items by person