Electronic Raman scattering and the renormalization of the electron spectrum in LuB12

The electronic Raman scattering in LuB 12 single crystals of various isotope compositions is studied in the temperature range 10–650 K. The shape and the energy position of spectral maxima depend on the direction and magnitude of a probe wavevector, the temperature, and the excitation symmetry and r...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2016-09, Vol.123 (3), p.506-510
Main Authors: Ponosov, Yu. S., Streltsov, S. V., Levchenko, A. V., Filippov, V. B.
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Electronic Properties of Solid
Elementary Particles
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theory
Raman spectra
Relativity Theory
Solid State Physics
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Summary:The electronic Raman scattering in LuB 12 single crystals of various isotope compositions is studied in the temperature range 10–650 K. The shape and the energy position of spectral maxima depend on the direction and magnitude of a probe wavevector, the temperature, and the excitation symmetry and remain unchanged when the isotope composition changes. Experimental spectra are compared with the spectra simulated on the basis of a calculated electronic structure. The experimental results are successfully described when the electron spectrum renormalization effects caused by electron–phonon coupling are taken into account. This confirms that the origin of the observed spectra in LuB 12 is due to Raman scattering by electrons. A comparison of the calculated and experimental data makes it possible to determine the coupling constant (λ ep = 0.32) that gives the correct superconducting transition temperature.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776116090077