Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Normal-state properties of the antiperovskite oxide Sr$_{3-x}$SnO
  revealed by $^{119}$Sn-NMR   We have performed $^{119}$Sn-NMR measurements on the antiperovskite oxide
superconductor Sr$_{3-x}$SnO to investigate how its normal state changes with
the Sr deficiency. A two-peak structure was observed in the NMR spectra of all
the measured samples. This suggests that the phase separation tends to occur
between the nearly stoichiometric and heavily Sr-deficient Sr$_{3-x}$SnO
phases. The measurement of the nuclear spin-lattice relaxation rate $1/T_1$
indicates that the Sr-deficient phase shows a conventional metallic behavior
due to the heavy hole doping. In contrast, the nearly stoichiometric phase
exhibits unusual temperature dependence of $1/T_1$, attributable to the
presence of a Dirac-electron band.

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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
3
The categories of this paper are: physics