Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Model of the Interplay of Band J-T Effect with Magnetic Order Mediated
  by Exchange Interaction   A model calculation is presented with the aim to study the interplay between
magnetic and structural transitions. The model consists of an orbitally doubly
degenerate conduction band and a periodic array of local moments. The band
electrons interact with the local spins via the s-f interaction. The
interaction of the band electrons with phonons is introduced by including band
Jahn-Teller (J-T) interaction. The model Hamiltonian, including the above
terms, is solved for the single particle Greens function. In doing this an
ansatz for selfenergy of electrons, which was developed earlier has been
utilized. The quasiparticle density of states (QDOS) and hence the orbital
populations are calculated treating the ferromagnetism of local moments in the
mean field approximation. The critical value of electron-phonon interaction
($G$) for the appearance of the band J-T distortion is higher in the
ferromagnetic state. The strain appears at a critical temperature ($T_s$) when
$G$ is greater than the critical value. The onset of ferromagnetism at $T_C$
($<T_s$) arrests the growth of the strain. It is concluded that the
magnetization hinders the structural transition. The quasiparticle density of
states are presented to interpret these results.

13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int