Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Muon spin rotation study of the topological superconductor SrxBi2Se3   We report transverse-field (TF) muon spin rotation experiments on single
crystals of the topological superconductor Sr$_x$Bi$_2$Se$_3$ with nominal
concentrations $x=0.15$ and $0.18$ ($T_c \sim 3$ K). The TF spectra ($B= 10$
mT), measured after cooling to below $T_c$ in field, did not show any
additional damping of the muon precession signal due to the flux line lattice
within the experimental uncertainty. This puts a lower bound on the magnetic
penetration depth $\lambda \geq 2.3 ~\mu$m. However, when we induce disorder in
the vortex lattice by changing the magnetic field below $T_c$ a sizeable
damping rate is obtained for $T \rightarrow 0$. The data provide microscopic
evidence for a superconducting volume fraction of $\sim 70~ \%$ in the $x=0.18$
crystal and thus bulk superconductivity.

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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: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg