Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on `Strong Vortex Liquid Correlation' from Multiterminal
  Measurements on Untwinned YBa$_2$Cu$_3$O$_{7-\delta}$ Single Crystals'   A.Rydh and \"O.Rapp [Phys. Rev. Lett. {\bf 86}, 1873 (2001).] claim that the
vortex liquid in untwinned YBa$_2$Cu$_3$O$_{7-\delta}$ crystals is correlated
above the melting transition, in striking contrast to previous work [D.L\'opez
{\it et al.}, Phys. Rev. Lett. {\bf 76}, 4034 (1996).]. In this Comment we
present new measurements using the same experimental technique on twinned and
untwinned YBa$_2$Cu$_3$O$_{7-\delta}$ crystals with similar overall
characteristics as those reported by Rydh and Rapp . The comparison of the
vortex correlation response in both cases indicates that the central conclusion
of their work is not correct. Our results reconfirm the work by L\'opez {\it et
al.} and points on the origin of the misinterpretation in the work of Rydh and
Rapp.

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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas