Low Temperature Physics: 35, 76 (2009); https://doi.org/10.1063/1.3064913 (3 pages)
Fizika Nizkikh Temperatur: Volume 35, Number 1 (January 2009), p. 99-102    ( to contents , go back )

Ultrasonic investigation of the Jahn-Teller effect in ZnSe:Fe2+ crystal

V.V. Gudkov1,2,3, A.T. Lonchakov3, I.V. Zhevstovskikh3, V.I. Sokolov3, and V.T. Surikov4

1Ural State Tecknical University, Mira st. 19, Ekaterinburg 620002, Russia

2The state professional - pedagogical university Street. Machine engineers, 11, Ekaterinburg, 620012, Russia

3Institute of Metal Physics RAS, Ekaterinburg 620041, Russia
E-mail: gudkov@imp.uran.ru

4Институт химии твердого тела Уральского отделения Российской академии наук ул. Первомайская, 91, г. Екатеринбург, 620041, Россия
pos Анотація:

Received Jule 21, 2008


Temperature dependences of absorption and phase velocity of transverse ultrasonic waves propagating along the [110] axis were investigated in the ZnSe:Fe2+ crystal (with dopant concentration n = 2.2·1019 cm-3) at the frequency 53 MHz in the interval of 1.4-100 К. A peak of absorption at 7.3 К and a decrease of phase velocity below 40 К were observed for a slow transverse mode while the fast mode did not display such anomalies. These anomalies were interpreted as a manifestation of the Jahn-Teller effect. The local distortions in ZnSe:Fe2+ have a tetragonal character. Within the assumption that the absorption peak has a relaxation origin, the temperature dependence of relaxation time was reconstructed and the potential barrier and the vibronic frequency were estimated.

PACS: 43.35.+d Ultrasonics, quantum acoustics, and physical effects of sound;
PACS: 61.72.uj III–V and II–VI semiconductors;
PACS: 62.20.D– Solid–liquid transitions;
PACS: 64.70.K– Solid–solid transitions.

Key words: semiconductors, elastic moduli, ultrasonic

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