Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Disappearance and Survival of Superconductivity in FeSe under High
  Pressure   Superconductivity in FeSe was investigated under high pressure through the
measurements of DC magnetization by using a diamond anvil cell. We successfully
observed that the disappearance of the superconductivity as a results of the
appearance of the non-superconducting ortho I\hspace{-1pt}I phase above $\sim$7
GPa ($\sim$5 GPa), when Ar (glycerin) is used as the pressure transmitting
media. Contrary to this, it has been found that the superconductivity even
survives under pressure above 7 GPa, when the thickness ($t$) of a
platelet-single crystal specimen is reduced. The survival of the
superconductivity above 7 GPa is consistent with a previous observation under
hydrostatic pressure by using a cubic anvil apparatus, suggesting that the
hydrostaticity of the pressure is improved by reducing $t$. It is also inferred
that the appearance of the ortho I\hspace{-1pt}I phase is due to uniaxial
stress along the [001] direction.

19
The categories of this paper are: eess
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat