Journal
PHYSICAL REVIEW B
Volume 81, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.100501
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Funding
- Department of Energy, Office of Basic Energy and Sciences [DEAC02-76SF00515]
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We use magnetic force microscopy (MFM) to measure the local penetration depth lambda in Ba(Fe0.95Co0.05)(2)As-2 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 rho(s) 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 lambda, as well as obtain its temperature dependence and spatial homogeneity. We find rho(s) to be uniform on the submicron scale despite the highly disordered vortex pinning.
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