Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence of nodal gap structure in the non-centrosymmetric
  superconductor Y2C3   The magnetic penetration depth $\lambda (T)$ and the upper critical field $%
\mu_{0}H_{c2}(T_{c})$ of the non-centrosymmetric (NCS) superconductor Y$_{2}
$C$_{3}$ have been measured using a tunnel-diode (TDO) based resonant
oscillation technique. We found that the penetration depth $\lambda (T)$ and
its corresponding superfluid density $\rho_{s}(T)$ show linear temperature
dependence at very low temperatures ($T\ll T_{c}$), indicating the existence of
line nodes in the superconducting energy gap. Moreover, the upper critical
field $\mu_{0}H_{c2}(T_{c})$ presents an upturn at low temperatures with a
rather high value of $\mu_{0}H_{c2}(0)$ $\simeq 29$T, which slightly exceeds
the weak-coupling Pauli limit. We discuss the possible origins for these
nontrivial superconducting properties, and argue that the nodal gap structure
in Y$_{2}$C$_{3}$ is likely attributed to the absence of inversion symmetry,
which allows the admixture of spin-singlet and spin-triplet pairing states.

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The categories of this paper are: astro-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
19
The categories of this paper are: eess
2
The categories of this paper are: math
3
The categories of this paper are: physics