Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconventional superconductivity and normal state properties of
  epsilon-iron at high pressure   Following the discovery of superconductivity in epsilon-iron, subsequent
experiments hinted at non-Fermi liquid behaviour of the normal phase and
sensitive dependence of the superconducting state on disorder, both signatures
of unconventional pairing. We report further resistive measurements under
pressure of samples of iron from multiple sources. The normal state resistivity
of epsilon-iron varied as rho_0+AT^{5/3} at low temperature over the entire
superconducting pressure domain. The superconductivity could be destroyed by
mechanical work, and was restored by annealing, demonstrating sensitivity to
the residual resistivity rho_0. There is a strong correlation between the rho_0
and A coefficients and the superconducting critical temperature T_c. Within the
partial resistive transition there was a significant current dependence, with
V(I)=a(I-I_0)+bI^2, with a >> b, possibly indicating flux-flow resistivity,
even in the absence of an externally applied magnetic field.

26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th