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Microscopic study of the superconducting state of the iron pnictide RbFe_{2}As_{2} via muon spin rotation


Shermadini, Z; Kanter, J; Baines, C; Bendele, M; Bukowski, Z; Khasanov, R; Klauss, H-H; Luetkens, H; Maeter, H; Pascua, G; Batlogg, B; Amato, A (2010). Microscopic study of the superconducting state of the iron pnictide RbFe_{2}As_{2} via muon spin rotation. Physical Review. B, Condensed Matter and Materials Physics, 82(14):144527.

Abstract

A study of the temperature and field dependence of the penetration depth λ of the superconductor RbFe2As2(Tc=2.52 K) was carried out by means of muon-spin rotation measurements. In addition to the zero-temperature value of the penetration depth λ(0)=267(5) nm, a determination of the upper critical field Bc2(0)=2.6(2) T was obtained. The temperature dependence of the superconducting carrier concentration is discussed within the framework of a multigap scenario. Compared to the other “122” systems which exhibit much higher Fermi level, a strong reduction in the large gap BCS ratio 2Δ/kBTc is observed. This is interpreted as a consequence of the absence of interband processes. Indications of possible pair-breaking effect are also discussed.

© 2010 The American Physical Society

Abstract

A study of the temperature and field dependence of the penetration depth λ of the superconductor RbFe2As2(Tc=2.52 K) was carried out by means of muon-spin rotation measurements. In addition to the zero-temperature value of the penetration depth λ(0)=267(5) nm, a determination of the upper critical field Bc2(0)=2.6(2) T was obtained. The temperature dependence of the superconducting carrier concentration is discussed within the framework of a multigap scenario. Compared to the other “122” systems which exhibit much higher Fermi level, a strong reduction in the large gap BCS ratio 2Δ/kBTc is observed. This is interpreted as a consequence of the absence of interband processes. Indications of possible pair-breaking effect are also discussed.

© 2010 The American Physical Society

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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:2010
Deposited On:13 Feb 2011 15:15
Last Modified:07 Dec 2017 07:14
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.82.144527
Related URLs:http://arxiv.org/abs/1005.3989

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