Local measurement of the penetration depth in the pnictide superconductor Ba( Fe0.95Co0.05)2As2

Lan Luan; Ophir M. Auslaender; Thomas M. Lippman; Clifford W. Hicks; Beena Kalisky; Jiun Haw Chu; James G. Analytis; Ian R. Fisher; John R. Kirtley; Kathryn A. Moler

doi:10.1103/PhysRevB.81.100501

Local measurement of the penetration depth in the pnictide superconductor Ba( Fe_0.95Co_0.05)₂As₂

Lan Luan, Ophir M. Auslaender, Thomas M. Lippman, Clifford W. Hicks, Beena Kalisky, Jiun Haw Chu, James G. Analytis, Ian R. Fisher, John R. Kirtley, Kathryn A. Moler

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Abstract

We use magnetic force microscopy (MFM) to measure the local penetration depth λ in Ba (Fe0.95 Co0.05) 2 As2 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	English
Article number	100501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.81.100501
State	Published - 2 Mar 2010
Externally published	Yes

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Luan, L., Auslaender, O. M., 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_0.95Co_0.05)₂As₂. Physical Review B - Condensed Matter and Materials Physics, 81(10), Article 100501. https://doi.org/10.1103/PhysRevB.81.100501

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abstract = "We use magnetic force microscopy (MFM) to measure the local penetration depth λ in Ba (Fe0.95 Co0.05) 2 As2 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.",

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AU - Auslaender, Ophir M.

AU - Lippman, Thomas M.

AU - Hicks, Clifford W.

AU - Kalisky, Beena

AU - Chu, Jiun Haw

AU - Analytis, James G.

AU - Fisher, Ian R.

AU - Kirtley, John R.

AU - Moler, Kathryn A.

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Local measurement of the penetration depth in the pnictide superconductor Ba( Fe_0.95Co_0.05)₂As₂

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