Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and
  arsenide superconductors   Previous experimental results have shown important differences between iron
selenide and arsenide superconductors, which seem to suggest that the high
temperature superconductivity in these two subgroups of iron-based family may
arise from different electronic ground states. Here, we report the complete
phase diagram of a newly synthesized superconducting (SC) system
(Li1-xFex)OHFeSe with a similar structure to FeAs-based superconductors. In the
non-SC samples, an antiferromagnetic (AFM) spin-density-wave (SDW) transition
occurs at ~127 K. This is the first example to demonstrate such an SDW phase in
FeSe-based superconductor system. Transmission electron microscopy (TEM) shows
that a well-known sqrr(5) x sqrr(5) iron vacancy ordered state, resulting in an
AFM order at ~ 500K in AyFe2-xSe2 (A = metal ions) superconductor system, is
absent in both non-SC and SC samples, but a unique superstructure with a
modulation wave vector q=1/2(1, 1, 0), identical to that seen in SC phase of
KyFe2-xSe2, is dominant in the optimal SC sample (with an SC transition
temperature Tc = 40 K). Hence, we conclude that the high-Tc superconductivity
in (Li1-xFex)OHFeSe stems from the similarly weak AFM fluctuations as
FeAs-based superconductors, suggesting a universal physical picture for both
iron selenide and arsenide superconductors.

13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ