Relaxation in ZnSe : Cr2+ investigated with longitudinal ultrasonic waves / Gudkov VV,Lonchakov AT,Sokolov VI,Zhevstovskikh IV // PHYSICAL REVIEW B. - 2006. - V. 73, l. 3.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

Temperature dependences of phase velocity and absorption of ultrasound were investigated in ZnSe crystal doped with Cr2+ ions at the frequencies 32-158 MHz. Absorption peak and variation of phase velocity found in the temperature interval 10-20 K were interpreted as manifestation of the Jahn-Teller effect. Temperature dependences of relaxation time, relaxed, and unrelaxed moduli C=1/2(C-11+C-12+2C(44)) were restored. The dependences were compared with the results of such investigations in ZnSe:Ni2+ and analyzed regarding lattice stability of the crystals. Fitting of the temperature dependence of the relaxation time was done with account of thermal activation over the potential barrier, quantum tunnelling with phonon emission, and two phonon process analogous to Raman scattering. Thermal activation proved to be the dominant mechanism of relaxation above 6 K and quantum tunnelling-below this temperature.

Author keywords:

ZNSE-NI; ELASTIC-CONSTANTS; PHASE-TRANSITION; IMPURITIES

DOI:

10.1103/PhysRevB.73.035213

Web of Science ID:

ISI:000235009500083

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JAN
Publisher	AMERICAN PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	035213
Keywords-Plus	ZNSE-NI; ELASTIC-CONSTANTS; PHASE-TRANSITION; IMPURITIES
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	gudkov@imp.uran.ru lonchakov@imp.uran.ru visokolov@imp.uran.ru zhevstovskikh@imp.uran.ru
ResearcherID-Numbers	Zhevstovskikh, Irina/K-1162-2013 Lonchakov, Alexander/K-6005-2013 Gudkov, Vladimir/L-2597-2013 Sokolov, Viktor/J-9376-2013
ORCID-Numbers	Zhevstovskikh, Irina/0000-0002-3277-1403 Lonchakov, Alexander/0000-0002-2797-4863 Gudkov, Vladimir/0000-0001-9925-9239 Sokolov, Viktor/0000-0002-6252-8914
Number-of-Cited-References	23
Usage-Count-Since-2013	4
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	007ZH