Journal
PHYSICAL REVIEW B
Volume 79, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.144414
Keywords
band structure; chemical vapour deposition; chromium compounds; Curie temperature; ellipsometry; ferromagnetic materials; magnetic epitaxial layers; magnetic transitions; optical conductivity; titanium compounds
Funding
- ONR [N00014-08-1-0746]
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The optical properties of half-metallic CrO2 at temperatures below, at, and above the Curie temperature are studied by means of variable angle spectroscopic ellipsometry. The films were epitaxially grown on (100)- and (110)-oriented TiO2 substrates by chemical vapor deposition. Optical conductivity data reveal a pronounced anisotropy of the optical constants for all films which is in good agreement with what is known about their crystal structure. The main features of the conductivity spectra in the ferromagnetic state are consistent with existing band-structure calculations. However, no temperature dependence of these features across the ferromagnetic transition is evident, posing questions about the electronic structure of the material.
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