Experimental determination of the Fermi surface of the spin spiral compound

H.-K. Jeong; T. Valla; R. Berger; P. D. Johnson; K. E. Smith

doi:10.1209/0295-5075/77/27001

All issues

Volume 77 / No 2 (January 2007)

EPL, 77 2 (2007) 27001

Abstract

Issue		EPL Volume 77, Number 2, January 2007


Article Number		27001
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/77/27001
Published online		10 January 2007

EPL, 77 (2007) 27001

Experimental determination of the Fermi surface of the spin spiral compound $\chem{TICo_2Se_2}$

H.-K. Jeong¹, T. Valla², R. Berger³, P. D. Johnson² and K. E. Smith¹

¹ 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: ksmith@bu.edu

Received: 11 September 2006
Accepted: 15 November 2006

Abstract

The electronic structure of ${\rm TlCo}_{2}{\rm Se}_{2}$ has been measured using high resolution angle resolved photoemission spectroscopy. ${\rm TlCo}_{2}{\rm Se}_{2}$ 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 $\sim 121^{\circ }$ 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 quasi $\hbox{--}$ two-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

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