Anisotropy of the superconducting gap in the iron-based superconductor BaFe(2)(As(1-x)P(x))(2)

We report peculiar momentum-dependent anisotropy in the superconducting gap observed by angle-resolved photoemission spectroscopy in BaFe(2)(As(1-x)P(x))(2) (x = 0.30, T(c) = 30 K). Strongly anisotropic gap has been found only in the electron Fermi surface while the gap on the entire hole Fermi surf...

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Detalles Bibliográficos
Autores principales: Yoshida, T., Ideta, S., Shimojima, T., Malaeb, W., Shinada, K., Suzuki, H., Nishi, I., Fujimori, A., Ishizaka, K., Shin, S., Nakashima, Y., Anzai, H., Arita, M., Ino, A., Namatame, H., Taniguchi, M., Kumigashira, H., Ono, K., Kasahara, S., Shibauchi, T., Terashima, T., Matsuda, Y., Nakajima, M., Uchida, S., Tomioka, Y., Ito, T., Kihou, K., Lee, C. H., Iyo, A., Eisaki, H., Ikeda, H., Arita, R., Saito, T., Onari, S., Kontani, H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4252890/
https://www.ncbi.nlm.nih.gov/pubmed/25465027
http://dx.doi.org/10.1038/srep07292
Descripción
Sumario:We report peculiar momentum-dependent anisotropy in the superconducting gap observed by angle-resolved photoemission spectroscopy in BaFe(2)(As(1-x)P(x))(2) (x = 0.30, T(c) = 30 K). Strongly anisotropic gap has been found only in the electron Fermi surface while the gap on the entire hole Fermi surfaces are nearly isotropic. These results are inconsistent with horizontal nodes but are consistent with modified s(±) gap with nodal loops. We have shown that the complicated gap modulation can be theoretically reproduced by considering both spin and orbital fluctuations.

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