Local Measurement of the Penetration Depth in the Pnictide Superconductor Ba(Fe_0.95 Co_0.05)_2 As_2

Journal Article · Mon Jan 11 00:00:00 EST 2010 · Submitted to Physical Review B

OSTI ID:970452

Matsushita, Y

We use magnetic force microscopy (MFM) to measure the local penetration depth {lambda} in Ba(Fe{sub 0.95}Co{sub 0.05}){sub 2}As{sub 2} single crystals and use scanning SQUID susceptometry to measure its temperature variation down to 0.4 K. We observe that superfluid density {rho}{sub 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}{sub s} to be uniform on the submicron scale despite the highly disordered vortex pinning.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 970452
• Report Number(s): SLAC-PUB-13879; TRN: US201002%%1153
• Journal Information: Submitted to Physical Review B, Journal Name: Submitted to Physical Review B
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMIC FORCE MICROSCOPY
MAGNETIC FIELDS
MONOCRYSTALS
PENETRATION DEPTH
PNICTIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE