Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3
  as Insulating Barrier   A spin-tunnel-junction based on manganites, with La$_{1-x}$Sr$_x$MnO$_3$
(LSMO) as ferromagnetic metallic electrodes and the undoped parent compound
LaMnO$_3$ (LMO) as insulating barrier, is here theoretically discussed using
double exchange model Hamiltonians and numerical techniques. For an even number
of LMO layers, the ground state is shown to have anti-parallel LSMO magnetic
moments. This highly resistive, but fragile, state is easily destabilized by
small magnetic fields, which orient the LSMO moments in the direction of the
field. The magnetoresistance associated with this transition is very large,
according to Monte Carlo and Density Matrix Renormalization Group studies. The
influence of temperature, the case of an odd number of LMO layers, and the
differences between LMO and SrTiO$_3$ as barriers are also addressed. General
trends are discussed.

30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an