Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetoresistance From Quantum Interference Effects in Ferromagnets   The desire to maximize the sensitivity of read/write heads and thus the
information density of magnetic storage devices has produced an intense
interest in the magnetoresistance (MR) of magnetic materials. Recent
discoveries include "colossal" MR of the manganites1-4 and the enhanced MR of
low carrier density ferromagnets4-6. In the low carrier density systems
investigated to date as well as the manganites, a key feature is that the
electrical conduction is due to a different set of electrons than the localized
electrons responsible for the magnetism. Here we propose a mechanism for
ferromagnetic MR originating from quantum interference effects, rather than
simple scattering. The new mechanism obtains in disordered low carrier density
magnets where the magnetism as well as the electrical conduction are due to the
same electrons. Here the MR is positive and only weakly temperature dependent
below the Curie point. This is very different from the MR seen when conduction
electrons and local moments can be treated separately, in which case the MR is
negative and strongly peaked at the Curie point.

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
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn