Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric-field controlled superconductor-ferromagnetic insulator
  transition   How to control collectively ordered electronic states is a core interest of
condensed matter physics. We report an electric field controlled reversible
transition from superconductor to ferromagnetic insulator in (Li,Fe)OHFeSe thin
flake using solid ion conductor as the gate dielectric. By driving Li ions into
and out of the (Li,Fe)OHFeSe thin flake with electric field, we obtained a
dome-shaped superconducting region with optimal Tc ~ 43 K, which is separated
by a quantum critical point from ferromagnetically insulating phase. The
ferromagnetism arises from the long range order of the interstitial Fe ions
expelled from the (Li,Fe)OH layers by Li injection. The device can reversibly
manipulate collectively ordered electronic states and stabilize new metastable
structures by electric field.

30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
18
The categories of this paper are: econ
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys