Abstract
The time τ of the spin-Peierls phase transition is analyzed theoretically as a function of the duration τ p of the exciting light pulse and the average number x 0 of absorbed photons per magnetic ion after the transmission of the pulse. It is shown that the phase transition occurs at x 0 > x c . The critical value x c is determined as a function of the duration τ p of the light pulse. A photoinduced variation in the optical reflection coefficient R is calculated as a function of time t. The results of calculation are compared with experimental data on ultrafast photoinduced melting of the low-temperature spin-Peierls phase into potassium tetracyanoquinodimethan (K-TCNQ).
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Original Russian Text © A.L. Semenov, 2015, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 147, No. 2, pp. 305–312.
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Semenov, A.L. The time of a photoinduced spin-Peierls phase transition. J. Exp. Theor. Phys. 120, 268–274 (2015). https://doi.org/10.1134/S1063776115020041
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DOI: https://doi.org/10.1134/S1063776115020041