Issue |
Europhys. Lett.
Volume 68, Number 1, October 2004
|
|
---|---|---|
Page(s) | 93 - 99 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2004-10174-9 | |
Published online | 01 September 2004 |
Weak spin-orbit interactions induce exponentially flat mini-bands in magnetic metals without inversion symmetry
Institut für Theoretische Physik, Universität zu Köln - 50937 Köln, Germany
Received:
10
June
2004
Accepted:
5
August
2004
In metallic magnets like the interplay of two very
weak spin-orbit coupling effects can strongly modify the Fermi
surface. In the absence of inversion symmetry even a very small
Dzyaloshinsky-Moriya interaction of strength
distorts a ferromagnetic state into a chiral helix with a long
pitch of order
. We show that additional small
spin-orbit coupling terms of order δ in the band structure
lead to the formation of exponentially flat mini-bands with a
bandwidth of order
parallel to the
direction of the helix. These flat mini-bands cover a rather
broad belt of width
on the Fermi surface where
electron motion parallel to the helix practically stops. We argue
that these peculiar band structure effects lead to pronounced
features in the anomalous skin effect.
PACS: 75.30.-m – Intrinsic properties of magnetically ordered materials / 75.47.-m – Magnetotransport phenomena; materials for magnetotransport / 71.20.-b – Electron density of states and band structure of crystalline solids
© EDP Sciences, 2004
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