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Title: Direct Spectroscopic Observation of the Energy Gap Formation in the Spin Density Wave Phase Transition at the Cr(110) Surface

Abstract

The spin density wave phase transition in chromium has been studied by angle-resolved photoemission on a (110) surface. The electronic band structure is shown to exhibit backfolding in the antiferromagnetic state. Direct spectroscopic evidence is obtained on the gradual opening of an energy gap at the Fermi level. The gap extends almost isotropically around the {Gamma} point, its magnitude reaching {approximately}200 meV at room temperature. Density-functional band structure calculations confirm the location of the energy gap in reciprocal space and yield enhanced magnetic moments towards the surface. The transition probed in the near-surface layers exhibits a critical temperature of {approximately}440 K . {copyright} {ital 1999} {ital The American Physical Society }

Authors:
; ;  [1]; ;  [2]
  1. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Department of Physics, University of Oregon, Eugene, Oregon 97403 (United States)
Publication Date:
OSTI Identifier:
686475
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 83; Journal Issue: 10; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; FERMI LEVEL; CHROMIUM; ENERGY GAP; SPIN WAVES; PHASE TRANSFORMATIONS; PHOTOEMISSION; ELECTRONIC STRUCTURE; MAGNETIC MOMENTS; THIN FILMS; ADVANCED LIGHT SOURCE

Citation Formats

Schaefer, J., Rotenberg, E., Meigs, G., Schaefer, J., and Kevan, S.D. Direct Spectroscopic Observation of the Energy Gap Formation in the Spin Density Wave Phase Transition at the Cr(110) Surface. United States: N. p., 1999. Web. doi:10.1103/PhysRevLett.83.2069.
Schaefer, J., Rotenberg, E., Meigs, G., Schaefer, J., & Kevan, S.D. Direct Spectroscopic Observation of the Energy Gap Formation in the Spin Density Wave Phase Transition at the Cr(110) Surface. United States. doi:10.1103/PhysRevLett.83.2069.
Schaefer, J., Rotenberg, E., Meigs, G., Schaefer, J., and Kevan, S.D. Wed . "Direct Spectroscopic Observation of the Energy Gap Formation in the Spin Density Wave Phase Transition at the Cr(110) Surface". United States. doi:10.1103/PhysRevLett.83.2069.
@article{osti_686475,
title = {Direct Spectroscopic Observation of the Energy Gap Formation in the Spin Density Wave Phase Transition at the Cr(110) Surface},
author = {Schaefer, J. and Rotenberg, E. and Meigs, G. and Schaefer, J. and Kevan, S.D.},
abstractNote = {The spin density wave phase transition in chromium has been studied by angle-resolved photoemission on a (110) surface. The electronic band structure is shown to exhibit backfolding in the antiferromagnetic state. Direct spectroscopic evidence is obtained on the gradual opening of an energy gap at the Fermi level. The gap extends almost isotropically around the {Gamma} point, its magnitude reaching {approximately}200 meV at room temperature. Density-functional band structure calculations confirm the location of the energy gap in reciprocal space and yield enhanced magnetic moments towards the surface. The transition probed in the near-surface layers exhibits a critical temperature of {approximately}440 K . {copyright} {ital 1999} {ital The American Physical Society }},
doi = {10.1103/PhysRevLett.83.2069},
journal = {Physical Review Letters},
number = 10,
volume = 83,
place = {United States},
year = {1999},
month = {9}
}