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27 April 2024 |
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Magnetotransport in La(Fe,Ru)AsO as a probe of band structure and mobility | | I.Pallecchi
; F.Bernardini
; M.Tropeano
; A.Palenzona
; A.Martinelli
; C.Bernini
; C.Ferdeghini
; M.Vignolo
; S. Massidda
; M.Putti
; | | Date: |
20 Jun 2011 | | Abstract: | In this work we investigate the Ru substituted LaFeAsO compound, by studying
the magnetotransport behaviour and its relationship with the band structure, in
different regimes of temperature, magnetic field and Ru content. In particular
we analyse the magnetoresistance of LaFe1-xRuxAsO (0 leq x leq 0.6) samples
with the support of ab initio calculations and we find out that in the whole
series: (i) the transport is dominated by electron bands only; (ii) the
magnetoresistance exhibits distinctive features related to the presence of
Dirac cones; indeed, ab initio calculations confirm the presence of anisotropic
Dirac cones in the band structure; (iii) the low temperature mobility is
exceptionally high and reaches 18.6 m2/(Vs) in the Ru-free sample at T=2K, in
the extreme limit of a single Landau level occupied in the Dirac cones; (iv)
the mobility drops abruptly above 10K-15K; (v) the disorder has a very weak
effect on the band mobilities and on the transport properties; (vi) there
exists a correlation between the temperature ranges of Dirac cones and SDW
carrier condensation. These findings may be of crucial importance in the
investigation of the pairing mechanism in the F-doped superconducting
La(Fe,Ru)As(O,F) compounds related to this series of parent compounds. | | Source: | arXiv, 1106.3973 | | Services: | Forum | Review | PDF | Favorites | |
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