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Title
Japanese: 
English:Isotropic Kink and Quasiparticle Excitations in the Three-Dimensional Perovskite Manganite La 0.6 Sr 0.4 MnO3 
Author
Japanese: 堀場弘司, 北村未歩, 吉松 公平, 簔原 誠人, 坂井 延寿, 小林正起, 藤森 淳, 組頭 広志.  
English: Koji Horiba, Miho Kitamura, Kohei Yoshimatsu, Makoto Minohara, Enju Sakai, Masaki Kobayashi, Atsushi Fujimori, Hiroshi Kumigashira.  
Language English 
Journal/Book name
Japanese: 
English:PHYSICAL REVIEW LETTERS 
Volume, Number, Page Vol. 116        076401
Published date Feb. 17, 2016 
Publisher
Japanese: 
English:American Physical Society 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
File
Official URL http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.076401
 
DOI http://dx.doi.org/10.1103/PhysRevLett.116.076401
Abstract 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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