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Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co_{0.074}Fe_{0.926})_{2}As_{2}


Ofer, O; Baglo, J; Hossain, M; Kiefl, R; Hardy, W; Thaler, A; Kim, H; Tanatar, M; Canfield, P; Prozorov, R; Luke, G; Morenzoni, E; Saadaoui, H; Suter, A; Prokscha, T; Wojek, B; Salman, Z (2012). Absolute value and temperature dependence of the magnetic penetration depth in Ba(Co_{0.074}Fe_{0.926})_{2}As_{2}. Physical Review B, 85(6):060506.

Abstract

The absolute value and temperature dependence of the in-plane magnetic penetration depth y have been measured on a single crystal of Ba(Co0.074Fe0.926)2As2 using low-energy muon-spin rotation and microwave cavity perturbation. The magnetic field profiles in the Meissner state are consistent with a local London model beyond a depth of 15 nm. We determine the gap symmetry through measurements of the temperature dependence of the superfluid density which follows a two-gap s-wave model over the entire temperature range below Tc. While the intermediate to high temperature data is well fit by an energy gap model in the BCS-like (weak-coupling) limit, a second smaller gap becomes apparent at low temperatures.

Abstract

The absolute value and temperature dependence of the in-plane magnetic penetration depth y have been measured on a single crystal of Ba(Co0.074Fe0.926)2As2 using low-energy muon-spin rotation and microwave cavity perturbation. The magnetic field profiles in the Meissner state are consistent with a local London model beyond a depth of 15 nm. We determine the gap symmetry through measurements of the temperature dependence of the superfluid density which follows a two-gap s-wave model over the entire temperature range below Tc. While the intermediate to high temperature data is well fit by an energy gap model in the BCS-like (weak-coupling) limit, a second smaller gap becomes apparent at low temperatures.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2012
Deposited On:19 Apr 2012 06:40
Last Modified:03 Nov 2017 14:21
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.85.060506

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