Optical properties of quasi-tetragonal BiFeO3 thin films | Zendy

P. Chen | Zendy; Nikolas J. Podraza | Zendy; Xiaoshan Xu | Zendy; Alexander Melville | Zendy; Eftihia Vlahos | Zendy; Venkatraman Gopalan | Zendy; R. Ramesh | Zendy; Darrell G. Schlom | Zendy; J. L. Musfeldt | Zendy

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Optical properties of quasi-tetragonal BiFeO3 thin films

Author(s) -

P. Chen,

Nikolas J. Podraza,

Xiaoshan Xu,

Alexander Melville,

Eftihia Vlahos,

Venkatraman Gopalan,

R. Ramesh,

Darrell G. Schlom,

J. L. Musfeldt

Publication year - 2010

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3364133

Subject(s) - tetragonal crystal system , materials science , band gap , thin film , absorption (acoustics) , epitaxy , absorption spectroscopy , ellipsometry , spectroscopy , infrared , condensed matter physics , ultraviolet , optoelectronics , optics , chemistry , crystallography , crystal structure , physics , nanotechnology , layer (electronics) , quantum mechanics , composite material

Optical transmission spectroscopy and spectroscopic ellipsometry were used to extract the optical properties of an epitaxially grown quasi-tetragonal BiFeO3 thin film in the near infrared to near ultraviolet range. The absorption spectrum is overall blue shifted compared with that of rhombohedral BiFeO3, with an absorption onset near 2.25 eV, a direct 3.1 eV band gap, and charge transfer excitations that are ∼0.4 eV higher than those of the rhombohedral counterpart. We interpret these results in terms of structural strain and local symmetry breaking.

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