Orbital-dependent band renormalization in BaNi2(As1−xPx)2 (x = 0.00 and 0.092)

Tomohiro Noda, Kazutaka Kudo, Masaya Takasuga, Minoru Nohara, Takuya Sugimoto, Daiki Ootsuki, Masaki Kobayashi, Koji Horiba, Kanta Ono, Hiroshi Kumigashira, Atsushi Fujimori, Naurang L. Saini, Takashi Mizokawa

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Abstract

We have studied the multi-band electronic structure of BaNi2(As1xPx)2 (x = 0.00 and 0.092) in which the P substitution suppresses unusual Ni–Ni zigzag bond order and induces strong coupling superconductivity. At x = 0.092, all the Fermi surfaces predicted by the ab-initio band calculations are successfully identified including the small electron pocket around the Z point. Interestingly, whereas the Ni 3d xy and x2 − y2 bands crossing EF agree with the band calculations, the Ni 3d yz=zx bands around 1 eV below the Fermi level (EF) are moderately renormalized similar to those in the Fe-based superconductors. The orbital-dependent band renormalization in BaNi2(As1xPx)2 indicates that the less correlated xy and x2 − y2 bands play important roles in the strong coupling superconductivity. Across the Ni–Ni bond order at x = 0.00, the less correlated Ni 3d xy and x2 − y2 bands near EF are selectively reconstructed across the Ni–Ni bond order. The band reconstruction is consistent with the orbital-selective Peierls instability proposed by Streltsov and Khomskii [Phys. Rev. B 89, 161112(R) (2014)], in which the itinerant orbital sector governs the structural instability and fluctuations.

Original languageEnglish
Article number064708
JournalJournal of the Physical Society of Japan
Volume86
Issue number6
DOIs
Publication statusPublished - Jun 15 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Noda, T., Kudo, K., Takasuga, M., Nohara, M., Sugimoto, T., Ootsuki, D., Kobayashi, M., Horiba, K., Ono, K., Kumigashira, H., Fujimori, A., Saini, N. L., & Mizokawa, T. (2017). Orbital-dependent band renormalization in BaNi2(As1−xPx)2 (x = 0.00 and 0.092). Journal of the Physical Society of Japan, 86(6), [064708]. https://doi.org/10.7566/JPSJ.86.064708