Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Colossal magnetoresistance in a Mott insulator via magnetic field-driven
  insulator-metal transition   We present a new type of colossal magnetoresistance (CMR) arising from an
anomalous collapse of the Mott insulating state via a modest magnetic field in
a bilayer ruthenate, Ti-doped Ca$_3$Ru$_2$O$_7$. Such an insulator-metal
transition is accompanied by changes in both lattice and magnetic structures.
Our findings have important implications because a magnetic field usually
stabilizes the insulating ground state in a Mott-Hubbard system, thus calling
for a deeper theoretical study to reexamine the magnetic field tuning of Mott
systems with magnetic and electronic instabilities and spin-lattice-charge
coupling. This study further provides a model approach to search for CMR
systems other than manganites, such as Mott insulators in the vicinity of the
boundary between competing phases.

34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph