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27 April 2024

» arxiv » 1005.3989

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Microscopic Study of the Superconducting State of the Iron Pnictide RbFe_2As_2
Z. Shermadini ; J. Kanter ; C. Baines ; M. Bendele ; Z. Bukowski ; R. Khasanov ; H.-H. Klauss ; H. Luetkens ; H. Maeter ; G. Pascua ; B. Batlogg ; A. Amato ;
Date:	21 May 2010
Abstract:	A study of the temperature and field dependence of the penetration depth lambda of the superconductor RbFe_2As_2 (T_c=2.52 K) was carried out by means of muon-spin rotation measurements. In addition to the zero temperature value of the penetration depth lambda(0)=267(5) nm, a determination of the upper critical field B_c2(0)=2.6(2) T was obtained. The temperature dependence of the superconducting carrier concentration is discussed within the framework of a multi-gap scenario. Compared to the other "122" systems which exhibit much higher Fermi level, a strong reduction of the large gap BCS ratio 2Delta/k_B T_c is observed. This is interpreted as a consequence of the absence of interband processes. Indications of possible pair-breaking effect are also discussed.
Source:	arXiv, 1005.3989
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