Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pressure induced re-emergence of superconductivity in superconducting
  topological insulator Sr0.065Bi2Se3   The recent-discovered Sr$_x$Bi$_2$Se$_3$ superconductor provides an
alternative and ideal material base for investigating possible topological
superconductivity. Here, we report that in Sr$_{0.065}$Bi$_{2}$Se$_3$, the
ambient superconducting phase is gradually depressed upon the application of
external pressure. At high pressure, a second superconducting phase emerges at
above 6 GPa, with a maximum $T_c$ value of $\sim$8.3 K. The joint
investigations of the high-pressure synchrotron x-ray diffraction and
electrical transport properties reveal that the re-emergence of
superconductivity in Sr$_{0.065}$Bi$_{2}$Se$_3$ is closely related to the
structural phase transition from ambient rhombohedral phase to high-pressure
monoclinic phase around 6 GPa, and further to another high-pressure tetragonal
phase above 25 GPa.

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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
33
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: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-th