Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Upper critical fields well above 100 T for the superconductor
  SmFeAsO$_{0.85}$F$_{0.15}$ with T$_c$ = 46 K   We report specific heat measurements at magnetic fields up to 20 T on the
recently discovered superconductor SmFeAsO$_{0.85}$F$_{0.15}$. The B-T diagram
of a polycrystalline SmFeAsO$_{0.85}$F$_{0.15}$ sample with T$_c$ = 46 K was
investigated. The temperature dependence of B$_{c2}$ was extracted from the
specific heat curves, the corresponding B$_{c2}$(T = 0) value derived from the
Werthamer-Helfand-Hohenberg formula being 150 T. Based on magnetization
measurements up to 9 T, a first estimation of the field dependence of the
inductive critical current J$_c$ is given. Evidence for granularity is found.
The presence of a peak effect is reported, suggesting a crossover in the vortex
dynamics, in analogy to the behaviour observed in high T$_c$ cuprates.

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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con