Determining the Parameters of the Jahn–Teller Effect in Impurity Centers from Ultrasonic Experiments: Application to the ZnSe : Ni2+ Crystal


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The earlier developed methodology of ultrasonic investigation for determining the parameters of the Jahn–Teller effect (JTE) in impurity centers in crystals is further developed in application to Ni2+ impurities in ZnSe : Ni2+. For all normal modes propagating along the [110] axis, the temperature dependences of the attenuation of ultrasound are measured in the frequency range 25–165 MHz. At a temperature of about 13 K, for all these modes, attenuation peaks are observed, which indicate the presence of local distortions of both trigonal and tetragonal types. Following the previously developed method, it is shown that these anomalies of attenuation are caused by the relaxation transitions between equivalent local distortions induced by the JTE at the Ni2+ centers. In the tetrahedral environment of selenium, this ion is in the threefold degenerate ground electron state 3T1, in which three types of the JTE can be realized. The data of ultrasonic experiments indicate the realization of the T ⊗ (e + t2) problem, in which the potential energy surface has four equivalent minima of the trigonal type, slightly deformed toward tetragonal saddle points. The trigonal vibronic constants, the stabilization energies of the trigonal minima, and the activation energy of the barriers between them are ev-aluated.

作者简介

M. Sarychev

Ural Federal University Named after the First President of Russia B. N. Yeltsin

Email: zhevstovskikh@imp.uran.ru
俄罗斯联邦, Yekaterinburg, 620075

I. Zhevstovskikh

Ural Federal University Named after the First President of Russia B. N. Yeltsin; Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: zhevstovskikh@imp.uran.ru
俄罗斯联邦, Yekaterinburg, 620075; Yekaterinburg, 620108

N. Averkiev

Ioffe Institute

Email: zhevstovskikh@imp.uran.ru
俄罗斯联邦, St. Petersburg, 194021

I. Bersuker

Institute for Theoretical Chemistry, the University of Texas at Austin

Email: zhevstovskikh@imp.uran.ru
美国, Austin, Texas

V. Gudkov

Ural Federal University Named after the First President of Russia B. N. Yeltsin

Email: zhevstovskikh@imp.uran.ru
俄罗斯联邦, Yekaterinburg, 620075

V. Surikov

Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences

Email: zhevstovskikh@imp.uran.ru
俄罗斯联邦, Yekaterinburg, 620990

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