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Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4

Kyuil Cho, A. Fente, S. Teknowijoyo, M. A. Tanatar, K. R. Joshi, N. M. Nusran, T. Kong, W. R. Meier, U. Kaluarachchi, I. Guillamón, H. Suderow, S. L. Bud'ko, P. C. Canfield, and R. Prozorov
Phys. Rev. B 95, 100502(R) – Published 8 March 2017

Abstract

Measurements of the London penetration depth Δλ(T) and tunneling conductance in single crystals of the recently discovered stoichiometric iron-based superconductor CaKFe4As4 (CaK1144) show nodeless, two-effective-gap superconductivity with a larger gap of about 6–10 meV and a smaller gap of about 1–4 meV. Having a critical temperature Tc,onset35.8 K, this material behaves similar to slightly overdoped (Ba1xKx)Fe2As2 (e.g., x=0.54,Tc34 K), a known multigap s± superconductor. We conclude that the superconducting behavior of stoichiometric CaK1144 demonstrates that two-gap s± superconductivity is an essential property of high-temperature superconductivity in iron-based superconductors, independent of the degree of substitutional disorder.

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  • Received 20 June 2016
  • Revised 30 November 2016

DOI:https://doi.org/10.1103/PhysRevB.95.100502

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kyuil Cho1, A. Fente2, S. Teknowijoyo1, M. A. Tanatar1, K. R. Joshi1, N. M. Nusran1, T. Kong1, W. R. Meier1, U. Kaluarachchi1, I. Guillamón2, H. Suderow2, S. L. Bud'ko1, P. C. Canfield1, and R. Prozorov1,*

  • 1Ames Laboratory, Ames and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 2Laboratorio de Bajas Temperaturas, Unidad Asociada UAM CSIC, Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain

  • *Corresponding author: prozorov@ameslab.gov

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Issue

Vol. 95, Iss. 10 — 1 March 2017

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