Local measurement of the penetration depth in the pnictide superconductor Ba (Fe 0.95 Co 0.05) 2 As 2

L Luan; OM Auslaender; TM Lippman; CW Hicks; B. Kalisky; JH Chu; JG Analytis; IR Fisher; JR Kirtley; KA Moler

Local measurement of the penetration depth in the pnictide superconductor Ba (Fe 0.95 Co 0.05) 2 As 2

L Luan, OM Auslaender, TM Lippman, CW Hicks, B. Kalisky, JH Chu, JG Analytis, IR Fisher, JR Kirtley, KA Moler

Department of Physics

Research output: Contribution to journal › Article › peer-review

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.

Original language	American English
Journal	Physical Review B (Condensed Matter and Materials Physics)
Volume	81
Issue number	10
State	Published - 2010

Cite this

@article{64d727ef912649389e74574f9af59082,

title = "Local measurement of the penetration depth in the pnictide superconductor Ba (Fe 0.95 Co 0.05) 2 As 2",

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.",

author = "L Luan and OM Auslaender and TM Lippman and CW Hicks and B. Kalisky and JH Chu and JG Analytis and IR Fisher and JR Kirtley and KA Moler",

year = "2010",

language = "American English",

volume = "81",

journal = "Physical Review B (Condensed Matter and Materials Physics)",

number = "10",

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TY - JOUR

T1 - Local measurement of the penetration depth in the pnictide superconductor Ba (Fe 0.95 Co 0.05) 2 As 2

AU - Luan, L

AU - Auslaender, OM

AU - Lippman, TM

AU - Hicks, CW

AU - Kalisky, B.

AU - Chu, JH

AU - Analytis, JG

AU - Fisher, IR

AU - Kirtley, JR

AU - Moler, KA

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

UR - http://journals.aps.org/prb/pdf/10.1103/PhysRevB.81.100501

M3 - Article

VL - 81

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

IS - 10

ER -

Local measurement of the penetration depth in the pnictide superconductor Ba (Fe 0.95 Co 0.05) 2 As 2

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