Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe4As4

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-...

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Detalles Bibliográficos
Autores: Cho, Kyuil, Fente, A., Teknowijoyo, S., Tanatar, M. A., Joshi, K. R., Nusran, N. M., Kong, T., Meier, W. R., Kaluarachchi, U., Guillamón Gómez, Isabel, Suderow Rodríguez, Hermann Jesús, Bud'Ko, S. L., Canfield, P. C., Prozorov, R.
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/689831
Acceso en línea:http://hdl.handle.net/10486/689831
https://dx.doi.org/10.1103/PhysRevB.95.100502
Access Level:acceso abierto
Palabra clave:Superconducting order parameter
Unconventional superconductors
Física
Descripción
Sumario: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,onset≈35.8 K, this material behaves similar to slightly overdoped (Ba1-xKx)Fe2As2 (e.g., x=0.54,Tc≈34 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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