Energy gap of the spin density wave at the Cr(110) surface

Angle resolved photoemission is used to directly monitor the energy gap of the spin density wave of Cr at a (110) surface. Density functional calculat ions, including a Fermi surface contour, predict an energy gap in the surfa ce proximity. Surface states are identified, and a near-surface gap of simi lar to 200 meV at room temperature is found, using spectroscopy, extending above the Fermi level. The gap exhibits an increased critical temperature o f similar to 440 K and extends isotropically around the Gamma point. (C) 20 00 Elsevier Science B.V. All rights reserved.