Summary
The acoustic-absorption coefficient was measured at 25, 35, 45 MHz in CdSe at liquid-nitrogen temperature. Measurements were performed both during the illumination of the smaple and in the time subsequent to the end of the illumination. It was shown that, in suitable conditions, a secondary peak of absorption takes place after the light pulse. The experimental results are explained in terms of electron-phonon interactions following a calculation due to Lommes and Weichman, and are related to the behaviour of the sample with respect to the phenomenon of residual conductivity.
Riassunto
È stato misurato il coefficiente di assorbimento acustico in monocristalli di CdSe alle frequenze di 25, 35 e 45 MHz alla temperatura dell'azoto liquido. Tali misure sono state eseguite sia durante l'illuminazione del campione, che nel periodo seguente la fine del flash luminoso. Si è trovato che, in condizioni opportune, appare, dopo la fine del flash, un picco secondario di assorbimento. I risultati sperimentali sono interpretati tenendo conto dell'interazione elettrone-fonone, seguendo un calcolo di Lommes e Weichman, e sono altresi relativi al comportamento di questo tipo di materiali per quel che riguarda il fenomeno della conducibilità residua.
Резюме
Проводятся измерения коэффициента акустического поглощения при 25, 35, 45 Мгц в CdSe при температуре жидкого азота. Измерения проводились и во время облучения образца и посяе облучения. Показывается, что при соответствующих условиях вторичный пик поглощения имеет место после светового импульса. Экспериментальные результаты объясняются в терминах электрон-фононного взаимодействия, следуя вычислениям Ломмеса и Вейхмана. Полученные результаты связаны с поведением образца в отношении явления остаточной проводимости.
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References
G. Carini jr.,G. Galli andF. Wanderlingh:Nuovo Cimento,18 B, 363 (1973).
G. Carini, G. Galli andF. Wanderlingh:On the behaviour of residual conductivity in CdSe, to be published.
R. K. Lommes andF. L. Weichman:Journ. Appl. Phys.,43, 590 (1972).
R. Hutson, J. McFee andD. L. White:Phys. Rev. Lett.,7, 237 (1971).
A. R. Hutson andD. L. White:Journ. Appl. Phys.,33, 40 (1962). See alsoJ. Yamashita andK. Nakamura:Progr. Theor. Phys.,33, 1022 (1965).
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Ballarò, S., Cutroni, M. & Wanderlingh, F. Acoustic absorption and electron-phonon interaction in CdSe. Nuov Cim B 27, 51–58 (1975). https://doi.org/10.1007/BF02726337
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DOI: https://doi.org/10.1007/BF02726337