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

doi:10.1103/PhysRevB.82.144527

Microscopic Study of the Superconducting State of the Iron Pnictide RbFe_2As_2

Superconductivity 2015-05-19 v3

Authors: 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

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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 2\Delta/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.

Keywords

iron pnictide RbFe_2As_2 penetration depth muon-spin rotation upper critical field multi-gap superconductivity pair-breaking

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@article{arxiv.1005.3989,
  title  = {Microscopic Study of the Superconducting State of the Iron Pnictide RbFe_2As_2},
  author = {Z. Shermadini and J. Kanter and C. Baines and M. Bendele and Z. Bukowski and R. Khasanov and H. -H. Klauss and H. Luetkens and H. Maeter and G. Pascua and B. Batlogg and A. Amato},
  journal= {arXiv preprint arXiv:1005.3989},
  year   = {2015}
}

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5 pages, 4 figures

Microscopic Study of the Superconducting State of the Iron Pnictide RbFe_2As_2

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