Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magneto-transport study of intra- and intergrain transitions in the
  magnetic superconductors RuSr2GdCu2O8 and RuSr2(Gd1.5Ce0.5)Cu2O10   A characterization of the magnetic superconductors RuSr2GdCu2O8 [Ru-(1212)]
and RuSr2(Gd1.5Ce0.5)Cu2O10 [Ru-(1222)] through resistance measurements as a
function of temperature and magnetic field is presented. Two peaks in the
derivative of the resistive curves are identified as intra- and intergrain
superconducting transitions. Strong intragrain granularity effects are
observed, and explained by considering the antiphase boundaries between
structural domains of coherently rotated RuO6 octahedra as intragrain
Josephson-junctions. A different field dependence of the intragrain transition
temperature in these compounds was found. For Ru-(1212) it remains unchanged up
to 0.1 T, decreasing for higher fields. In Ru-(1222) it smoothly diminishes
with the increase in field even for a value as low as 100 Oe. These results are
interpreted as a consequence of a spin-flop transition of the Ru moments. The
large separation between the RuO2 layers in Ru-(1222) promotes a weak
interlayer coupling, leading the magnetic transition to occur at lower fields.
The suppression rate of the intragrain transition temperature is about five
times higher for Ru-(1222), a result we relate to an enhancement of the 2D
character of the vortex structure. A distinctive difference with conventional
cuprates is the sharp increase in amplitude of the intergrain peak in both
systems, as the field is raised, which is ascribed to percolation through a
fraction of high quality intergrain junctions.

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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: eess