Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positive and negative chemical pressure effects investigated in
  electron-doped FeSe films with an electric-double-layer structure   We investigated chemical pressure effects in electron-doped (e-doped) FeSe by
fabricating an electric-double-layer structure with single crystalline FeSe
films on LaAlO$_3$ with Se substituted by isovalent Te and S. Our method
enables transport measurements of e-doped FeSe. Electron doping by applying
gate voltage of 5 V increases $T_{\mathrm c}$ of the FeSe$_{1-x}$Te$_x$ and
FeSe$_{1-y}$S$_y$ films with $0 \leq x \leq 0.4$ and $0 \leq y \leq 0.25$,
while the e-doped $x=0.5$ film showed lower $T_{\mathrm c}$ than that of the
undoped one. Both positive and chemical pressure suppress $T_{\mathrm c}$ of
the e-doped FeSe. The obtained superconducting phase diagram in the e-doped
samples is rather different from that in undoped samples. This might suggest
that the superconductivity mechanism is different between undoped and e-doped
systems. Alternatively, this is possibly explained by the absence of the
nematic order in e-doped samples.

8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex