Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conventional superconductivity and charge-density-wave ordering in
  Ba1-xNaxTi2Sb2O   We have investigated the low temperature physical properties of BaTi2Sb2O and
Ba1-xNaxTi2Sb2O (x = 0.05, 0.1, 0.15, 0.2, 0.25, 0.3) by means of muon spin
rotation (muSR) and SQUID magnetometry. Our measurements reveal the absence of
magnetic ordering below TDW = 58 K in the parent compound. Therefore the phase
transition at this temperature observed by magnetometry is most likely due to
the formation of a charge density wave (CDW). Upon substitution of barium by
sodium in Ba1-xNaxTi2Sb2O we find for x = 0.25 superconductivity with a maximum
T_{c} = 5.1 K in the magnetization and a bulk T_{c,bulk} = 4.5 K in the muSR
measurements. The temperature dependency of the London penetration depth
lambda^-2(T) of the optimally doped compound can be well explained within a
conventional weak-coupling scenario in the clean limit.

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The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
2
The categories of this paper are: math