W. Vonderlinden et al., UNBIASED ACCESS TO EXCHANGE SPLITTING OF MAGNETIC BANDS USING THE MAXIMUM-ENTROPY METHOD, Physical review letters, 71(6), 1993, pp. 899-902
The experimental information about magnetic bands and their temperatur
e dependence is distorted by Fermi distribution and apparatus function
. The recovery of the spectral density constitutes an ill-posed invers
ion problem. We have invoked the maximum entropy regularization to dec
onvolute spin-resolved inverse photoemission data of Ni(110). The effe
ctive energy resolution is hereby improved by a factor of 5 and struct
ures below E(F), which are generally lost in inverse photoemission, ar
e recovered. The temperature-dependent data for Ni reveal clearly a pa
ir of spin-split bands. The splitting vanishes on approaching the Curi
e temperature.