Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: What drives the insulating state in ultrathin films of SrRuO3?   Using density functional calculations we have examined the evolution of the
electronic structure of SrRuO3 films grown on SrTiO3 substrates as a function
of film thickness. At the ultrathin limit of two monolayers (RuO2-terminated
surface) the films are found to be at the brink of a spin-state transition
which drives the system to an antiferromagnetic and insulating state.
Increasing the film thickness to four monolayers, one finds the surprising
result that two entirely different solutions coexist. An antiferromagnetic
insulating solution coexists with a metallic solution corresponding to an
antiferromagnetic surface and a ferromagnetic bulk. The electronic structure
found at the ultrathin limit persists for thicker films and an unusual result
is predicted. Thicker films are found to be metallic as expected for the bulk,
but the magnetism does not directly evolve to the bulk ferromagnetic state. The
surface remains antiferromagnetic while the bulk exhibits ferromagnetic
ordering.

12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an