Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lack of coupling between superconductivity and orthorhombic distortion
  in stoichiometric single-crystalline FeSe   The coupling between superconductivity and othorhombic distortion is studied
in vapor-grown FeSe single crystals using high-resolution thermal-expansion
measurements. In contrast to the Ba122-based (Ba122) superconductors, we find
that superconductivity does not reduce the orthorhombicity below Tc. Instead we
find that superconductivity couples strongly to the in-plane area, which
explains the large hydrostatic pressure effects. We discuss our results in
light of the spinnematic scenario and argue that FeSe has many features quite
different from the typical Fe-based superconductors.

12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph