Ultrasonic investigation of ZnSe : V2+ and ZnSe : Mn2+: Lattice softening and low-temperature relaxation in crystals with orbitally degenerate states / Gudkov V. V.,Lonchakov A. T.,Sokolov V. I.,Zhevstovskikh I. V.,Surikov V. T. // PHYSICAL REVIEW B. - 2008. - V. 77, l. 15.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

Temperature dependences of elastic moduli and ultrasonic attenuation were investigated in ZnSe:V2+ and ZnSe:Mn2+ crystals as functions of temperature in the interval of 1.4-100 K for frequencies of 52-270 MHz. A peak in the attenuation was found in ZnSe:V2+ below 4 K for fast shear and longitudinal waves propagating along the {[}110] crystallographic axis. We interpret it to be a manifestation of a relaxation process related to the Jahn-Teller effect in the 3d electron system of the impurity. Softening of the elastic moduli C-44 and C-center dot=(C-11+C-12+2C(44))/2 were observed below 40 K. Temperature dependences were deduced for relaxation time and relaxed and unrelaxed C-44 and C-center dot moduli. The temperature dependence of relaxation time shows that ZnSe:V2+ has potential barrier V-0=5.6 cm(-1). Softening of the C-44 modulus indicates that the local distortions have a trigonal character. Neither attenuation anomalies nor softening of the elastic moduli was observed in ZnSe:Mn2+, which has a singlet orbital ground state of the 3d impurity.

Author keywords:

NI

DOI:

10.1103/PhysRevB.77.155210

Web of Science ID:

ISI:000255457400066

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	155210
Keywords-Plus	NI
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 surikov@icss.uran.ru
ResearcherID-Numbers	Zhevstovskikh, Irina/K-1162-2013 Lonchakov, Alexander/K-6005-2013 Sokolov, Viktor/J-9376-2013 Gudkov, Vladimir/L-2597-2013
ORCID-Numbers	Zhevstovskikh, Irina/0000-0002-3277-1403 Lonchakov, Alexander/0000-0002-2797-4863 Sokolov, Viktor/0000-0002-6252-8914 Gudkov, Vladimir/0000-0001-9925-9239
Number-of-Cited-References	17
Usage-Count-Since-2013	7
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	295EI