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Title: Raman spectroscopy of isotopically pure ({sup 12}C, {sup 13}C) and isotopically mixed ({sup 12.5}C) diamond single crystals at ultrahigh pressures

Abstract

The Raman scattering by isotopically pure {sup 12}C and {sup 13}C diamond single crystals and by isotopically mixed {sup 12.5}C diamond single crystals is studied at a high accuracy. The studies are performed over a wide pressure range up to 73 GPa using helium as a hydrostatic pressure-transferring medium. It is found that the quantum effects, which determine the difference between the ratio of the Raman scattering frequencies in the {sup 12}C and {sup 13}C diamonds and the classical ratio (1.0408), increase to 30 GPa and then decrease. Thus, inversion in the sign of the quantum contribution to the physical properties of diamond during compression is detected. Our data suggest that the maximum possible difference between the bulk moduli of the {sup 12}C and {sup 13}C diamonds is 0.15%. The investigation of the isotopically mixed {sup 12.5}C diamond shows that the effective mass, which determines the Raman frequency, decreases during compression from 12.38 au at normal pressure to 12.33 au at 73 GPa.

Authors:
; ;  [1];  [2];  [1]
  1. Russian Academy of Sciences, Troitsk, Institute for High-Pressure Physics (Russian Federation)
  2. National Institute for Materials Science (Japan)
Publication Date:
OSTI Identifier:
22617186
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 123; Journal Issue: 3; Other Information: Copyright (c) 2016 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCURACY; CARBON 12; CARBON 13; CARBON ISOTOPES; COMPRESSION; DIAMONDS; EFFECTIVE MASS; HELIUM; HYDROSTATICS; MONOCRYSTALS; PHYSICAL PROPERTIES; PRESSURE RANGE GIGA PA; RAMAN EFFECT; RAMAN SPECTROSCOPY

Citation Formats

Enkovich, P. V., E-mail: enkovich@hppi.troitsk.ru, Brazhkin, V. V., Lyapin, S. G., Novikov, A. P., Kanda, H., and Stishov, S. M. Raman spectroscopy of isotopically pure ({sup 12}C, {sup 13}C) and isotopically mixed ({sup 12.5}C) diamond single crystals at ultrahigh pressures. United States: N. p., 2016. Web. doi:10.1134/S1063776116070049.
Enkovich, P. V., E-mail: enkovich@hppi.troitsk.ru, Brazhkin, V. V., Lyapin, S. G., Novikov, A. P., Kanda, H., & Stishov, S. M. Raman spectroscopy of isotopically pure ({sup 12}C, {sup 13}C) and isotopically mixed ({sup 12.5}C) diamond single crystals at ultrahigh pressures. United States. https://doi.org/10.1134/S1063776116070049
Enkovich, P. V., E-mail: enkovich@hppi.troitsk.ru, Brazhkin, V. V., Lyapin, S. G., Novikov, A. P., Kanda, H., and Stishov, S. M. 2016. "Raman spectroscopy of isotopically pure ({sup 12}C, {sup 13}C) and isotopically mixed ({sup 12.5}C) diamond single crystals at ultrahigh pressures". United States. https://doi.org/10.1134/S1063776116070049.
@article{osti_22617186,
title = {Raman spectroscopy of isotopically pure ({sup 12}C, {sup 13}C) and isotopically mixed ({sup 12.5}C) diamond single crystals at ultrahigh pressures},
author = {Enkovich, P. V., E-mail: enkovich@hppi.troitsk.ru and Brazhkin, V. V. and Lyapin, S. G. and Novikov, A. P. and Kanda, H. and Stishov, S. M.},
abstractNote = {The Raman scattering by isotopically pure {sup 12}C and {sup 13}C diamond single crystals and by isotopically mixed {sup 12.5}C diamond single crystals is studied at a high accuracy. The studies are performed over a wide pressure range up to 73 GPa using helium as a hydrostatic pressure-transferring medium. It is found that the quantum effects, which determine the difference between the ratio of the Raman scattering frequencies in the {sup 12}C and {sup 13}C diamonds and the classical ratio (1.0408), increase to 30 GPa and then decrease. Thus, inversion in the sign of the quantum contribution to the physical properties of diamond during compression is detected. Our data suggest that the maximum possible difference between the bulk moduli of the {sup 12}C and {sup 13}C diamonds is 0.15%. The investigation of the isotopically mixed {sup 12.5}C diamond shows that the effective mass, which determines the Raman frequency, decreases during compression from 12.38 au at normal pressure to 12.33 au at 73 GPa.},
doi = {10.1134/S1063776116070049},
url = {https://www.osti.gov/biblio/22617186}, journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 3,
volume = 123,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2016},
month = {Thu Sep 15 00:00:00 EDT 2016}
}