Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local structural distortions and their role in superconductivity in
  SmFeAsO$_{1-x}$F$_x$ superconductors   EXAFS studies at the As K edge as a function of temperature have been carried
out in SmFeAsO$_{1-x}$F$_x$ ($x$ = 0 and 0.2) compounds to understand the role
of local structural distortions superconductivity observed in F doped compound.
A significant correlation between thermal variation of local structural
parameters like anion height and superconducting onset is found in the
fluorinated compound. Such a variation in anion height is absent in
non-superconducting compound. Increase in Fe-As bond distance just below
superconducting onset temperature indicates a similarity in distortions
observed in high T$_C$ cuprates and these Fe based superconductors.

33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th