Variational model for strongly correlated fermions in a magnetic field
Abstract
For a single band of correlated fermions at T = 0 in a magnetic field h we prove that: (a) if n < 1 and U > 2 W, the effective mass for spinup (down) particles decreases (increases) with h; (b) if n = 1 and U < 2 W, the effective mass is spinindependent, the magnetoresistance is positive, and h induces a firstorder transition to the localized, magnetically saturated state.
 Publication:

Journal of Magnetism and Magnetic Materials
 Pub Date:
 February 1992
 DOI:
 10.1016/03048853(92)91403G
 Bibcode:
 1992JMMM..108..181A