تقرير
Elastic Softening in Synthetic Diamonds
| العنوان: | Elastic Softening in Synthetic Diamonds |
|---|---|
| المؤلفون: | Yanagisawa, Tatsuya, Hibino, Ruo, Hidaka, Hiroyuki, Amitsuka, Hiroshi, Tashima, Toshiyuki, Akatsu, Mitsuhiro, Nemoto, Yuichi, Zherlitsyn, Sergei, Wosnitza, Joachim |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons, Physics - Applied Physics |
| الوصف: | This study reveals a novel phenomenon demonstrating the elastic softening of synthetic diamonds when cooled to very low temperatures below 1 K. We present the results of ultrasonic measurements of single-crystalline synthetic diamonds without irradiation, 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 observed a divergent decrease of the elastic stiffness constant $C_{44}$ in all samples at low temperatures down to 20 mK. We argue for the existence of electric quadrupolar degrees of freedom with irreducible representation $T_2$ in diamond as the origin of this elastic softening. The possible ground state preserves local $T_d$ symmetry presumably down to absolute zero. Of the ground states of atomic vacancies in diamond proposed thus far, the only relevant one is the positively charged single atomic vacancy V$^+$, which has not been observed in previous optical measurements in diamonds. Comment: 8 Pages, 3 figures with supplemental materials |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2401.03377 |
| رقم الأكسشن: | edsarx.2401.03377 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |