Local measurement of the penetration depth in the pnictide superconductor Ba(Fe0.95Co0.05)2As2
Abstract
We use magnetic force microscopy (MFM) to measure the local penetration depth λ in Ba(Fe0.95Co0.05)2As2 single crystals and use scanning superconducting quantum interference device susceptometry to measure its temperature variation down to 0.4 K. We observe that superfluid density ρs over the full temperature range is well described by a clean two-band fully gapped model. We demonstrate that MFM can measure the important and hard-to-determine absolute value of λ, as well as obtain its temperature dependence and spatial homogeneity. We find ρs to be uniform on the submicron scale despite the highly disordered vortex pinning.
Citation
Luan , L , Auslaender , O , Lippman , T M , Hicks , C W , Kalisky , B , Chu , J-H , Analytis , J G , Fisher , I R , Kirtley , J R & Moler , K A 2010 , ' Local measurement of the penetration depth in the pnictide superconductor Ba(Fe 0.95 Co 0.05 ) 2 As 2 ' , Physical Review. B, Condensed matter and materials physics , vol. 81 , no. 10 , 100501 . https://doi.org/10.1103/PhysRevB.81.100501
Publication
Physical Review. B, Condensed matter and materials physics
Status
Peer reviewed
ISSN
1098-0121Type
Journal article
Collections
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.