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Antiphase Fermi-surface modulations accompanying displacement excitation in a parent compound of iron-based superconductors

Kozo Okazaki, Hakuto Suzuki, Takeshi Suzuki, Takashi Yamamoto, Takashi Someya, Yu Ogawa, Masaru Okada, Masami Fujisawa, Teruto Kanai, Nobuhisa Ishii, Jiro Itatani, Masamichi Nakajima, Hiroshi Eisaki, Atsushi Fujimori, and Shik Shin
Phys. Rev. B 97, 121107(R) – Published 13 March 2018
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Abstract

We investigate the transient electronic structure of BaFe2As2, a parent compound of iron-based superconductors, by time- and angle-resolved photoemission spectroscopy. In order to probe the entire Brillouin zone, we utilize extreme ultraviolet photons and observe photoemission intensity oscillation with the frequency of the A1g phonon which is antiphase between the zone-centered hole Fermi surfaces (FSs) and zone-cornered electron FSs. We attribute the antiphase behavior to the warping in one of the zone-centered hole FSs accompanying the displacement of the pnictogen height and find that this displacement is the same direction as that induced by substitution of P for As, where superconductivity is induced by a structural modification without carrier doping in this system.

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  • Received 25 August 2017

DOI:https://doi.org/10.1103/PhysRevB.97.121107

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Kozo Okazaki1,*, Hakuto Suzuki2, Takeshi Suzuki1, Takashi Yamamoto1, Takashi Someya1, Yu Ogawa1, Masaru Okada1, Masami Fujisawa1, Teruto Kanai1, Nobuhisa Ishii1, Jiro Itatani1, Masamichi Nakajima3, Hiroshi Eisaki3, Atsushi Fujimori2, and Shik Shin1,†

  • 1Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 2Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 3National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan

  • *Corresponding author: okazaki@issp.u-tokyo.ac.jp
  • Corresponding author: shin@issp.u-tokyo.ac.jp

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Issue

Vol. 97, Iss. 12 — 15 March 2018

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