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Muon-spin rotation measurements of the magnetic penetration depth in the iron-based superconductor Ba_{1−x}Rb_{x}Fe_{2}As_{2}


Guguchia, Z; Shermadini, Z; Amato, A; Maisuradze, A; Shengelaya, A; Bukowski, Z; Luetkens, H; Khasanov, R; Karpinski, J; Keller, H (2011). Muon-spin rotation measurements of the magnetic penetration depth in the iron-based superconductor Ba_{1−x}Rb_{x}Fe_{2}As_{2}. Physical Review. B, Condensed Matter and Materials Physics, 84(9):094513.

Abstract

Measurements of the magnetic penetration depth λ in the Fe-based superconductor Ba1−xRbxFe2As2 (x=0.3, 0.35, 0.4) were carried out using the muon-spin rotation (μSR) technique. The temperature dependence of λ is well described by a two-gap s + s-wave scenario with a small gap Δ1 ≈ 1–3 meV and a large gap Δ2≈7–9 meV. By combining the present data with those previously obtained for RbFe2As2 a decrease of the BCS ratio 2Δ2/kBTc with increasing Rb content x is observed. On the other hand, the BCS ratio 2Δ1/kBTc is almost independent of x. In addition, the contribution of Δ1 to the superfluid density is found to increase with x. These results are discussed in light of the suppression of interband processes upon hole doping.

Abstract

Measurements of the magnetic penetration depth λ in the Fe-based superconductor Ba1−xRbxFe2As2 (x=0.3, 0.35, 0.4) were carried out using the muon-spin rotation (μSR) technique. The temperature dependence of λ is well described by a two-gap s + s-wave scenario with a small gap Δ1 ≈ 1–3 meV and a large gap Δ2≈7–9 meV. By combining the present data with those previously obtained for RbFe2As2 a decrease of the BCS ratio 2Δ2/kBTc with increasing Rb content x is observed. On the other hand, the BCS ratio 2Δ1/kBTc is almost independent of x. In addition, the contribution of Δ1 to the superfluid density is found to increase with x. These results are discussed in light of the suppression of interband processes upon hole doping.

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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:2011
Deposited On:14 Nov 2011 11:55
Last Modified:07 Dec 2017 09:37
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.84.094513
Related URLs:http://arxiv.org/abs/1106.2437

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