Magneto-Optical Effects in the Paramagnetic and Ferromagnetic Phases of Cr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Br</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Borghesi, A.; Guizzetti, G.; Samoggia, G.; Reguzzoni, E.

doi:10.1103/physrevlett.47.538

Cited by 6 publications

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“…This spectrum shows just a broad nondescript band at the low edge of the visible range, characteristic of Cr 3+ d–d luminescence in a weak ligand field . Reports on the optical properties of CrCl 3 and CrBr 3 have followed a similar trajectory, with a handful of absorption − and reflectivity , studies dating from the 1960s to 1980s, until the recent pursuit of exfoliable magnetic materials led to a resurgence of interest in their properties. , The historical lack of attention given to CrX 3 PL likely results from their poor or non-existent emission at room temperature.…”

Section: Introductionmentioning

confidence: 97%

Luminescence and Covalency in Ytterbium-Doped CrX₃(X = Cl, Br, I) van der Waals Compounds

Snoeren,

Pressler,

Kluherz

et al. 2023

J. Am. Chem. Soc.

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The layered 2D van der Waals ferromagnets CrX3 (X = Cl, Br, I) show broad d–d photoluminescence (PL). Here we report preparation, structural characterization, and spectroscopic studies of all three CrX3 compounds doped with the optical impurity, Yb3+. EXAFS measurements show very similar Cr K-edge and Yb L-edge data for each doped compound, and good fits of the latter are obtained for structures having Yb3+ occupying substitutional octahedral sites. Yb–X bond lengths are systematically ∼0.25 Å larger than their Cr–X counterparts. 4 K PL measurements show efficient sensitization of Yb3+ luminescence upon photoexcitation into lattice absorption bands [Cr3+ d–d and ligand-to-metal charge-transfer (LMCT)] for all three compounds, converting their nondescript broadband d–d PL into sharp f–f emission. The PL of CrCl3:Yb3+ and CrBr3:Yb3+ occurs at energies typical for [YbX6]3– with these halides, with PL decay times of 0.5–1.0 ms at 4 K, but CrI3:Yb3+ displays anomalously low-energy Yb3+ emission and an unusually short PL decay time of only 8 μs at 4 K. Data analysis and angular overlap model (AOM) calculations show that Yb3+ in CrI3:Yb3+ has a lower spin–orbit splitting energy than reported for any other Yb3+ in any other compound. We attribute these observations to exceptionally high covalency of the Yb3+ f orbitals in CrI3:Yb3+ stemming primarily from the shallow valence-shell ionization potentials of the iodide anions.

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