Journal Article Isotropic Kink and Quasiparticle Excitations in the Three-Dimensional Perovskite Manganite La<sub> 0.6</sub> Sr<sub> 0.4</sub> MnO<sub>3</sub>

堀場, 弘司  ,  Horiba, Koji  ,  北村, 未歩  ,  Kitamura, Miho  ,  吉松, 公平  ,  Kohei, Yoshimatsu  ,  簔原, 誠人  ,  Minohara, Makoto  ,  坂井, 延寿  ,  Sakai, Enju  ,  小林, 正起  ,  Kobayashi, Masaki  ,  藤森, 淳  ,  Fujimori, Atsushi  ,  組頭, 広志  ,  Kumigashira, Hiroshi

116p.076401 , 2016-02 , American Physical Society
In order to reveal the many-body interactions in three-dimensional perovskite manganites that show colossal magnetoresistance, we performed an in situ angle-resolved photoemission spectroscopy on La 0.6 Sr 0.4 MnO 3 and investigated the behavior of quasiparticles. We observed quasiparticle peaks near the Fermi momentum in both the electron and the hole bands, and clear kinks throughout the entire hole Fermi surface in the band dispersion. This isotropic behavior of quasiparticles and kinks suggests that polaronic quasiparticles produced by the coupling of electrons with Jahn-Teller phonons play an important role in the colossal magnetoresistance properties of the ferromagnetic metallic phase of three-dimensional manganites.

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