Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic and Ising quantum phase transitions in a model for
  isoelectronically tuned iron pnictides   Considerations of the bad-metal behavior led to an early proposal for a
quantum critical point under a P for As doping in the iron pnictides, which has
since been experimentally observed. We study here an effective model for the
isoelectronically tuned pnictides using a large-$N$ approach. The model
contains antiferromagnetic and Ising-nematic order parameters appropriate for
$J_1$-$J_2$ exchange-coupled local moments on an Fe square lattice, and a
damping caused by coherent itinerant electrons. The zero-temperature magnetic
and Ising transitions are concurrent and essentially continuous. The
order-parameter jumps are very small, and are further reduced by the
inter-plane coupling; quantum criticality hence occurs over a wide dynamical
range. Our results provide the basis for further studies on the quantum
critical properties in the P-doped iron arsenides.

15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an