Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dendritic flux jumps in an organic superconducting crystal   Angle dependent torque measurements have been carried out on the organic
superconductor, kappa-(ET)2Cu(NCS)2 at extremely low temperatures (25 - 300
mK). Magneto-thermal instabilities are observed in the form of abrupt
magnetization (flux) jumps for magnetic field sweeps of 0 - 20 tesla. A fractal
analysis of the flux jumps indicates that the instabilities do show a self
similar structure with a fractal dimension varying between 1.15 - 1.6. The
fractal structure of the flux jumps in our sample shows a stricking similarity
to that of MgB2 thin film samples, in which magneto-optical experiments have
recently shown that the small flux jumps are due to the formation of dendritic
flux structures. These smaller instabilities act to suppress the critical
current density of these thin films. The similarity of the flux jump structure
of our samples suggests that we are also observing the dendritic instability,
but in a bulk sample rather than a thin film. This is the first observation of
the dendritic instability in a bulk superconducing sample, and is likely due to
the layered nature of kappa-(ET)2Cu(NCS)2, which results in a quasi-two
dimensional flux structure over the majority of it's mixed state phase diagram.

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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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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: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph