Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental test for subdominant superconducting phases with complex
  order parameters in cuprate grain boundary junctions   We propose and implement a direct experimental test for subdominant
superconducting phases with broken time-reversal symmetry in d-wave
superconductors. The critical current of 45-degree asymmetric grain boundary
junctions are shown to be extremely sensitive to the predicted onset of a
complex order parameter at (110)-surfaces and near magnetic impurities.
Measurements in YBCO and Ni-doped YBCO junctions indicate that the symmetry at
the surface is consistent with pure d-wave at all temperatures, putting limits
on the magnitude and chiral domain structure of any subdominant symmetry
component.

23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas