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Changes in optical ...
Changes in optical properties of MnAs thin films on GaAs(001) induced by a- to B-phase transition
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- Gallas, B. (författare)
- Inst de NanoSciences de Paris - CNRS, Université Pierre et Marie Curie, France
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- Rivory, J. (författare)
- Inst de NanoSciences de Paris - CNRS, Université Pierre et Marie Curie, France
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- Arwin, Hans, 1950- (författare)
- Linköpings universitet,Tillämpad optik,Tekniska högskolan
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- Vidal, F. (författare)
- Inst de NanoSciences de Paris - CNRS, Université Pierre et Marie Curie, France
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- Etgens, V.H. (författare)
- Inst de NanoSciences de Paris - CNRS, Université Pierre et Marie Curie, France
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(creator_code:org_t)
- Wiley-VCH Verlagsgesellschaft, 2008
- 2008
- Engelska.
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Ingår i: Physica Status Solidi (a) applications and materials science. - : Wiley-VCH Verlagsgesellschaft. - 1862-6300 .- 1862-6319. ; 205:4, s. 859-862
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- MnAs layers with 45 nm thickness were grown epitaxially on GaAs(001) substrates. Ellipsometry measurements were made in the spectral range 0.045 eV to 6 eV as a function of temperature (between –10 °C and 50 °C) at 70° of incidence. In this way the transition from the hexagonal α-phase to the orthorhombic β-phase could be monitored. Non-zero off-diagonal elements of the Jones matrix for an azimuth of 38° off the [10] axis of the substrate indicate that the optical functions of MnAs are anisotropic in both phases. The optical conductivity exhibits low-energy interband transitions around 0.3 eV, more clearly seen in the α-phase than in the β-phase. Extrapolation of the optical conductivity to zero frequency confirms that the α-phase is about two times more conducting than the β-phase. A broad structure is observed in the visible range around 3 eV. The α-phase is characterised by an anisotropy induced energy difference of this structure with a maximum at 2.8 eV for the extraordinary index and at 3.15 eV for the ordinary index. This difference vanishes in the β-phase in which anisotropy mainly induces changes in amplitude of the 3 eV structure. The assignment of the structures will be discussed.
Nyckelord
- NATURAL SCIENCES
- NATURVETENSKAP
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