Raman scattering in ZrB12 cage glass


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Abstract

High-precision measurements of the Hall effect and Raman scattering have been performed for single crystals of ZrB12 superconductor in the wide temperature range of 5–300 K. For ZrB12, the boson peak with ωmax ~ 100 cm–1 has been observed for the first time within the low-frequency range of the Raman spectrum I(ω). The sizes of vibrational clusters with the correlation length ranging from 25 to 35 Å are estimated. The relation between the renormalization of the low-frequency density of vibrational states accompanying the transition to the cage-glass phase (T* ~ 90 K) and the enhancement of superconductivity in ZrB12 is discussed.

About the authors

N. E. Sluchanko

Prokhorov General Physics Institute; Moscow Institute of Physics and Technology (State University)

Author for correspondence.
Email: nes@lt.gpi.ru
Russian Federation, ul. Vavilova 38, Moscow, 119991; Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700

A. N. Azarevich

Prokhorov General Physics Institute

Email: nes@lt.gpi.ru
Russian Federation, ul. Vavilova 38, Moscow, 119991

M. A. Anisimov

Prokhorov General Physics Institute

Email: nes@lt.gpi.ru
Russian Federation, ul. Vavilova 38, Moscow, 119991

A. V. Bogach

Prokhorov General Physics Institute

Email: nes@lt.gpi.ru
Russian Federation, ul. Vavilova 38, Moscow, 119991

S. Yu. Gavrilkin

Lebedev Physical Institute

Email: nes@lt.gpi.ru
Russian Federation, Leninskii pr. 53, Moscow, 119991

V. V. Glushkov

Prokhorov General Physics Institute; Moscow Institute of Physics and Technology (State University)

Email: nes@lt.gpi.ru
Russian Federation, ul. Vavilova 38, Moscow, 119991; Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700

S. V. Demishev

Prokhorov General Physics Institute; Moscow Institute of Physics and Technology (State University)

Email: nes@lt.gpi.ru
Russian Federation, ul. Vavilova 38, Moscow, 119991; Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700

A. A. Maksimov

Institute of Solid State Physics

Email: nes@lt.gpi.ru
Russian Federation, ul. Akademika Osipyana 2, Chernogolovka, Moscow region, 142432

I. I. Tartakovskii

Institute of Solid State Physics

Email: nes@lt.gpi.ru
Russian Federation, ul. Akademika Osipyana 2, Chernogolovka, Moscow region, 142432

E. V. Filatov

Institute of Solid State Physics

Email: nes@lt.gpi.ru
Russian Federation, ul. Akademika Osipyana 2, Chernogolovka, Moscow region, 142432

V. B. Filippov

Frantsevich Institute for Problems of Materials Science

Email: nes@lt.gpi.ru
Ukraine, ul. Krzhizhanovskogo 3, Kyiv, 03680

A. B. Lyashchenko

Frantsevich Institute for Problems of Materials Science

Email: nes@lt.gpi.ru
Ukraine, ul. Krzhizhanovskogo 3, Kyiv, 03680

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