Volume 77, Number 2, January 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 January 2007|
Experimental determination of the Fermi surface of the spin spiral compound
Department of Physics, Boston University - Boston, MA 02215, USA
2 Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory - Upton NY 11973, USA
3 Department of Materials Chemistry, Uppsala University - Box 538, S-75121, Uppsala, Sweden
Corresponding author: email@example.com
Accepted: 15 November 2006
The electronic structure of has been measured using high resolution angle resolved photoemission spectroscopy. is thought to be an example of an incommensurate spin spiral system, where the magnetic moments of the cobalt layers are aligned ferromagnetically in the ab plane, but the magnetic moments are rotated by along the c-axis. However, experimental evidence in the electronic structure supporting spin spiral states has been lacking. Our experimental results clearly show the existence of band crossings near the Fermi level that are consistent with such states. Our data also reveal a remarkably heavily nested square Fermi surface in the plane perpendicular to the spin spiral, confirming the predicted quasitwo-dimensional electronic structure.
PACS: 79.60.Bm – Clean metal, semiconductor, and insulator surfaces / 71.20.Be – Transition metals and alloys / 71.18.+y – Fermi surface: calculations and measurements; effective mass, g factor
© Europhysics Letters Association, 2007
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