Elastic Softening in Synthetic Diamonds
arxiv(2024)
摘要
This study reveals a novel phenomenon demonstrating the softening of
synthetic diamonds when cooled to very low temperatures below 1 K. Herein, we
argue that this elastic softening can be attributed to the effect of
electric-quadrupole degrees of freedom of the dangling bonds in the neutral
single-atom vacancies of carbon. We present the results of ultrasonic
investigations of single-crystalline synthetic diamonds, namely type-IIa
(colorless) and Ib (yellow) diamonds grown by high-pressure-high-temperature
synthesis as well as type-IIa diamond grown by chemical vapor deposition. We
observe a magnetic-field-insensitive softening of the elastic constant C_44
in all samples at low temperatures below 1 K. Our results strongly suggest a
ppb level concentration of neutral single-atomic vacancies in all investigated
diamonds. Our findings open new avenues for the quantitative determination of
single neutral vacancies in non-irradiated diamonds, an important information
needed for their potential application for quantum technology and
next-generation semiconductor devices.
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