Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Method of Probing the Phonon Mechanism in Superconductors
  including MgB$_{2}$   Weak localization has a strong influence on both the normal and
superconducting properties of metals. In particular, since weak localization
leads to the decoupling of electrons and phonons, the temperature dependence of
resistance (i.e., $\lambda_{tr}$) is decreasing with increasing disorder, as
manifested by Mooij's empirical rule. In addition, Testardi's universal
correlation of $T_{c}$ (i.e., $\lambda$) and the resistance ratio (i.e.,
$\lambda_{tr}$) follows. This understanding provides a new means to probe the
phonon mechanism in superconductors including MgB$_{2}$. The merits of this
method are its applicability to any superconductors and its reliability because
the McMillan's electron-phonon coupling constant $\lambda$ and $\lambda_{tr}$
change in a broad range, from finite values to zero, due to weak localization.
Karkin et al's preliminary data of irradiated MgB$_{2}$ show the Testardi
correlation, indicating that the dominant pairing mechanism in MgB$_{2}$ is the
phonon-mediated interaction.

25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an