Issue |
EPL
Volume 89, Number 6, March 2010
|
|
---|---|---|
Article Number | 67008 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/89/67008 | |
Published online | 19 April 2010 |
Incommensurate spin density wave in Co-doped BaFe2As2
CEA, Centre de Saclay, DSM/IRAMIS/Service de Physique de l'Etat Condensé 91191 Gif-sur-Yvette, France, EU
Corresponding author: pierre.bonville@cea.fr
Received:
16
December
2009
Accepted:
16
March
2010
57Fe Mössbauer spectroscopy measurements are presented in the underdoped Ba(Fe1-xCox)2As2 series for x = 0.014 (Tc < 1.4 K) and x = 0.03 and 0.045 (Tc 2 and 12 K, respectively). The spectral shapes in the so-called spin density wave (SDW) phase are interpreted in terms of incommensurate modulation of the magnetic structure, and allow the shape of the modulation to be determined. In undoped BaFe2As2, the magnetic structure is commensurate, and we find that incommensurability is present at the lowest doping level (x = 0.014). As Co doping increases, the low-temperature modulation progressively loses its “squaredness” and tends to a sine-wave. The same trend occurs for a given doping level, as temperature increases. We find that a magnetic hyperfine component persists far above the SDW transition, its intensity being progressively tranferred to a paramagnetic component on heating.
PACS: 74.70.Xa – Pnictides and chalcogenides / 75.30.Fv – Spin-density waves / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy
© EPLA, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.