Browsing by Author "Holcomb, Mikel B."

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    Modification of the Chemisorption Properties of Epitaxial Delafossite CuFeO2 Thin Films by Substituting Fe for Ga in the Crystal Structure
    (2018) Rojas, S.; Joshi, T.; Wang, Q.; Holcomb, Mikel B.; Lederman, D.; Cabrera, Alejandro Leopoldo
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    Structural and magnetic properties of epitaxial delafossite CuFeO2 thin films grown by pulsed laser deposition
    (2015) Joshi, Toyanath; Senty, Tess R.; Trappen, Robbyn; Zhou, Jinling; Chen, Song; Ferrari, Piero; Borisov, Pavel; Song, Xueyan; Holcomb, Mikel B.; Bristow, Alan D.; Cabrera, Alejandro L.; Lederman, David
    Growth of pure phase delafossite CuFeO2 thin films on Al2O3 (00.1) substrates by pulsed laser deposition was systematically investigated as a function of growth temperature and oxygen pressure. X-ray diffraction, transmission electron microscopy, Raman scattering, and x-ray absorption spectroscopy confirmed the existence of the delafossite phase. Infrared reflectivity spectra determined a band edge at 1.15 eV, in agreement with the bulk delafossite data. Magnetization measurements on CuFeO2 films demonstrated a phase transition at T-C approximate to 15 +/- 1K, which agrees with the first antiferromagnetic transition at 14K in the bulk CuFeO2. Low temperature magnetic phase is best described by commensurate, weak ferromagnetic spin ordering along the c-axis. (C) 2015 AIP Publishing LLC.