We have recently proposed that
superconductivity may be understood as
driven by the undressing of quasiparticles
as the superconducting
state develops. Similarly we propose here that ferromagnetism in metals
may be understood as driven by the undressing of quasiparticles as the
ferromagnetic state develops. In ferromagnets, the undressing is proposed
to occur due to the reduction in $bond$ $charge$ caused by spin polarization,
in contrast to superconductors where the undressing is proposed to occur
due to the reduction in $site$ $charge$ caused by (hole) pairing.
The undressing process manifests itself in the one and two-particle Green's
functions as a transfer of spectral weight from high to low frequencies.
Hence it should have universal observable consequences in one- and two-particle
spectroscopies such as photoemission and optical absorption.
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