Bogdanov, S. P.
Sergeeva, N. M.
Article History
Received: 2 September 2019
Revised: 13 September 2019
Accepted: 18 September 2019
First Online: 31 August 2020
ACKNOWLEDGMENTS
: The authors are grateful to S. A. Kukushkin for their constant attention and support, and special thanks to A. V. Redkov for measuring the Raman spectra and their discussion.