Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetotransport studies of FeSe under hydrostatic pressure   The discoveries of iron-based superconductors with relatively high transition
temperature are under intense experimental and theoretical investigation. Here
we present magnetotransport measurements on FeSe superconductor under
hydrostatic pressure. We show that in Fe-deficient tetragonal FeSe binary
compound, the onset of superconducting transition is almost doubled under
1.98GPa pressure and the estimated upper critical field of 26.7Tesla is
increased to 47.5Tesla.

8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math