Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Treatment of the Anderson-Hasegawa Model -- Effects of
  Superexchange and Polarons   We revisit the Anderson-Hasegawa double-exchange model and critically examine
its exact solution when the core spins are treated quantum mechanically.We show
that the quantum effects, in the presence of an additional superexchange
interaction between the core spins, yield a term, the significance of which has
been hitherto ignored. The quantum considerations further lead to new results
when polaronic effects, believed to be ubiquitous in manganites due to
electron-phonon coupling, are included. The consequence of these results for
the magnetic phase diagrams and the thermal heat capacity is also carefully
analysed.

1
The categories of this paper are: cs
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an