Geodesic
Dichroism of absorption of $\mathrm{Cr}^{2+}$ centers in $\mathrm{KZnF}_3$ crystal under uniaxial stress
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, Tome 152 (2010) no. 3, pp. 112-118
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Observation of the intense linear dichroism spectrum on the $^5E_g\to^5T_{2g}$ transition of $\mathrm{Cr}^{2+}$ ions in $\mathrm{KZnF}_3$ crystal under uniaxial pressure is reported. The model is proposed, which assigns the observed spectrum to the alignment of the Jahn–Teller $\mathrm{Cr}^{2+}$ centers occurring as a result of the redistribution between the adiabatic potential minima of the $E\otimes e$ vibronic problem that become inequivalent under uniaxial pressure applied along the $C_4$ axis of the crystal. Analysis of the observed dependences of the dichroism signal amplitude on the applied pressure made it possible to estimate the electron-strain constant $V_{ES}=33600\pm1300$ cm$^{-1}$ and the tunnel splitting $\delta=12.9\pm1.6$ cm$^{-1}$, as well as to characterize the random strain field in the crystal.
Mots-clés : Jahn–Teller effect, uniaxial pressure.
Keywords: impurity center, perovskite, dichroism 
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     author = {S. I. Nikitin and I. N. Subacheva and R. V. Yusupov},
     title = {Dichroism of absorption of $\mathrm{Cr}^{2+}$ centers in $\mathrm{KZnF}_3$ crystal under uniaxial stress},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {112--118},
     year = {2010},
     volume = {152},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2010_152_3_a16/}
}
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S. I. Nikitin; I. N. Subacheva; R. V. Yusupov. Dichroism of absorption of $\mathrm{Cr}^{2+}$ centers in $\mathrm{KZnF}_3$ crystal under uniaxial stress. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, Tome 152 (2010) no. 3, pp. 112-118. http://geodesic.mathdoc.fr/item/UZKU_2010_152_3_a16/

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