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Optical Spectra Measured on Cleaved Surfaces of Double‐Exchange Ferromagnet La 1—x Sr x MnO 3
Author(s) -
Takenaka K.,
Iida K.,
Sawaki Y.,
Sugai S.,
Moritomo Y.,
Nakamura A.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<637::aid-pssb637>3.0.co;2-4
Subject(s) - ferromagnetism , optical conductivity , condensed matter physics , spectral line , omega , metal , materials science , optical spectra , electrical resistivity and conductivity , drude model , reflectivity , atmospheric temperature range , conductivity , chemistry , optics , physics , thermodynamics , quantum mechanics , astronomy , metallurgy
Optical reflectivity spectra were measured on cleaved surfaces of La 1— x Sr x MnO 3 single crystals ( x = 0.175, T C = 283 K) over the temperature range 10 to 295 K. The optical conductivity σ(ω) shows, keeping single‐component nature, incoherent‐to‐coherent crossover with an increase of electrical conductivity. The σ(ω) spectrum of the low‐temperature ferromagnetic‐metallic phase (10 K) exhibits a pronounced Drude‐like component with large spectral weight, contrary to the previous result. The present result indicates that the optical spectrum of the manganites is sensitive to condition of sample surfaces.