Reflectance and thermoreflectance studies of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CrCl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CrBr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>,<mml:ma

Guizzetti, G.; Nosenzo, L.; Pollini, I.; Reguzzoni, E.; Samoggia, G.; Spinolo, G.

doi:10.1103/physrevb.14.4622

Cited by 35 publications

(11 citation statements)

References 19 publications

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“…16.18a is hardly resolvable. The principal experimental features [69,70] are represented by the theory, for instance the absorption edge and the double-peak structure above the absorption edge, though the latter ones are somewhat blueshifted against the measured peak positions. An exciton-mediated coupling between the spin channels (see Sect.…”

Section: Organic Hydrogen-bonded and Magnetic Systemsmentioning

confidence: 99%

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Optical Properties

Bechstedt¹

2014

Springer Series in Solid-State Sciences

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The macroscopic dielectric function requires the calculation of optical transition matrix elements. The use of wave functions of the single-particle problem with an effective local potential leads to the equivalence of longitudinal and transverse formulations for the optical transition operator. The advantage of the longitudinal approach is the easy inclusion of effects of spin-orbit interaction and non-localities due to exchange and correlation. The resulting matrix elements depend on the symmetry of initial and final state. The scenario of van Hove singularities to interprete the lineshape of optical spectra is significantly modified by the excitonic Coulomb effects. The excitonic redshift of the optical absorption partly compensates the blue shift due to quasiparticle effects. In addition, a redistribution of spectral strength from higher to lower photon energies and the formation of excitonic bound states occur. The combination of quasiparticle and excitonic effects, despite their treatment within the GW approximation, leads to optical and energy-loss spectra in good agreement with experimental findings. This is illustrated for anorganic and organic crystals but also for low-dimensional systems including molecules.

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Section: Organic Hydrogen-bonded and Magnetic Systemsmentioning

confidence: 99%

“…An approximate independent-QP (LDA+U +Δ, black solid line) spectrum and a spectrum with excitonic effects (BSE, blue solid line) are computed with a broadening parameter η = 0.2 eV. The two experimental spectra (red solid and dashed lines) are derived from reflectivity measurements [69,70]. From [71] …”

Section: Organic Hydrogen-bonded and Magnetic Systemsmentioning

confidence: 99%

Optical Properties

Bechstedt¹

2014

Springer Series in Solid-State Sciences

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“…As happens in several other insulating transition metal compounds [10], according to their d" configuration, the d electrons introduce the typical crystal-field transitions in the forbidden energy gap, while at energies greater than the absorption edge they give rise to the so-called ,,charge-transfer}) transitions, namely excitations from the valence band to the empty 3d levels localized on the metal ion. At higher energies, the kind of transitions we expected to find are the following:…”

Section: -Experimenta Lmentioning

confidence: 98%

NIR-VIS reflectivity spectra of some transition metal thiophosphates

et al. 1991

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Room temperature optical-reflectivity measurements on some transition metal thiophosphates were carried out in the near infrared and visible regions. The resulting spectra, interpreted on the basis of the <> model, agree well with earlier optical transmission measurements. Below the fundamental absorption edge, the observed features have been assigned to 3d-3d transitions occurring on the transition metal ion, while those observed at photon energies greater than the absorption threshold have been attributed to transitions from the valence bands to discrete 3d orbital levels or to the conduction bands. A more detailed information on the metal ion 3d levels energy distribution with respect to the valence band states belonging to the (P2S6)4- cluster and a more precise determination of the MPS3 absorption edge energy position have been obtained

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“…6 We have performed the measurements in the Faraday geometry with an external saturating magnetic field (fl = 6 kOe) parallel to the c axis of the crystal. The physical and chemical properties of CrBr 3 are extensively reported in Ref.…”

Section: Magneto-optical Effects In the Paramagnetic And Ferromagnetimentioning

confidence: 99%

“…1; the main features of the TR apparatus have been discussed elsewhere. 6 A temperature modulation AT of no more than 0.5 K has been used and the approximate size of AR/R in the peaks was 5x 10" 3 . Monochromatic light was circularly polarized by a Rochon prism and a quartz Babinet-Soleil compensator (\E y /E x \ 2^ 0.9, where E is the electric wave vector).…”

Section: Magneto-optical Effects In the Paramagnetic And Ferromagnetimentioning

confidence: 99%