Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-resistance YBa2Cu3O7-x grain-boundary Josephson junctions
  fabricated by electromigration   [100]-tilt grain-boundary YBa2Cu3O7-x (YBCO) junctions are promising for
investigation of macroscopic quantum phenomena in high-Tc Josephson junctions.
However, fabrication of the [100]-tilt grain-boundary YBCO junctions with a
high resistance, which are required to study quantum effects, is difficult
because of a high transparency of a tunnel barrier in this type of junctions.
Here, we demonstrate a modification of grain-boundary barrier properties with a
new approach to an oxygen electromigration in the YBCO grain-boundary junctions
when the oxygen diffuses under an applied electric field from the
grain-boundary to a BaTbO3 layer deposited atop of an YBCO film. Using this
approach, we changed the normal-state resistance of the junctions from tens to
several hundred Ohms without a degradation of their characteristic voltage IcRn
and determined a barrier height and thickness by measuring the quasiparticle
tunnelling current.

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The categories of this paper are: math
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph