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Small-Polaron Hopping and Low-Temperature (45–225 K) Photo-Induced Transient Absorption in Magnesium-Doped Lithium Niobate

1
School of Physics, Osnabrueck University, Barbarastraße 7, 49076 Osnabrueck, Germany
2
Institut für Angewandte Physik, TU Dresden, Nöthnitzerstr. 61, 01187 Dresden, Germany
3
ct.qmat: Dresden-Würzburg Cluster of Excellence—EXC 2147, Technische Universität Dresden, 01069 Dresden, Germany
4
Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA
*
Author to whom correspondence should be addressed.
Dedicated to the memory of Ortwin F. Schirmer (1937–2020).
These authors contributed equally to this work.
Crystals 2020, 10(9), 809; https://doi.org/10.3390/cryst10090809
Received: 20 August 2020 / Revised: 7 September 2020 / Accepted: 11 September 2020 / Published: 14 September 2020
(This article belongs to the Special Issue New Trends in Lithium Niobate: From Bulk to Nanocrystals)
A strongly temperature-dependent photo-induced transient absorption is measured in 6.5 mol% magnesium-doped lithium niobate at temperatures ranging from 45 K to 225 K. This phenomenon is interpreted as resulting from the generation and subsequent recombination of oppositely charged small polarons. Initial two-photon absorptions generate separated oppositely charged small polarons. The existence of these small polarons is monitored by the presence of their characteristic absorption. The strongly temperature-dependent decay of this absorption occurs as series of thermally assisted hops of small polarons that facilitate their merger and ultimate recombination. Our measurements span the high-temperature regime, where small-polaron jump rates are Arrhenius and strongly dependent on temperature, and the intermediate-temperature regime, where small-polaron jump rates are non-Arrhenius and weakly dependent on temperature. Distinctively, this model provides a good representation of our data with reasonable values of its two parameters: Arrhenius small-polaron hopping’s activation energy and the material’s characteristic phonon frequency. View Full-Text
Keywords: lithium niobate; small polaron hopping; transient absorption lithium niobate; small polaron hopping; transient absorption
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MDPI and ACS Style

Messerschmidt, S.; Krampf, A.; Vittadello, L.; Imlau, M.; Nörenberg, T.; Eng, L.M.; Emin, D. Small-Polaron Hopping and Low-Temperature (45–225 K) Photo-Induced Transient Absorption in Magnesium-Doped Lithium Niobate. Crystals 2020, 10, 809. https://doi.org/10.3390/cryst10090809

AMA Style

Messerschmidt S, Krampf A, Vittadello L, Imlau M, Nörenberg T, Eng LM, Emin D. Small-Polaron Hopping and Low-Temperature (45–225 K) Photo-Induced Transient Absorption in Magnesium-Doped Lithium Niobate. Crystals. 2020; 10(9):809. https://doi.org/10.3390/cryst10090809

Chicago/Turabian Style

Messerschmidt, Simon; Krampf, Andreas; Vittadello, Laura; Imlau, Mirco; Nörenberg, Tobias; Eng, Lukas M.; Emin, David. 2020. "Small-Polaron Hopping and Low-Temperature (45–225 K) Photo-Induced Transient Absorption in Magnesium-Doped Lithium Niobate" Crystals 10, no. 9: 809. https://doi.org/10.3390/cryst10090809

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