Elastic Softening in Synthetic Diamonds

YANAGISAWA Tatsuya

Department of Physics

Jun. 18, 2025

ダイヤモンドの結晶構造と様々な原子空孔

Joint press release (in Japanese)by Hokkaido University, and Niigata University

This study reveals a previously unreported phenomenon: elastic softening in synthetic diamonds at temperatures below 1 K. We present ultrasonic measurements on single-crystalline, non-irradiated synthetic diamonds — specifically, type-IIa (colorless) and type-Ib (yellow) samples grown by high-pressure high-temperature (HPHT) synthesis, as well as type-IIa diamonds grown by chemical vapor deposition (CVD). A pronounced, divergent decrease in the elastic stiffness constant C₄₄ was observed in all samples down to 20 mK. We attribute….

Read the original article on Journal of Physical Society of Japan（Letters）

Article inforamation
Tatsuya Yanagisawa, Ruo Hibino, Hiroyuki Hidaka, Hiroshi Amitsuka, Toshiyuki Tashima, Mitsuhiro Akatsu, Yuichi Nemoto, Sergei Zherlitsyn, and Joachim Wosnitza, Elastic Softening in Synthetic Diamonds,  Journal of Physical Society of Japan（Letters）, 94, 073602 (2025) 
DOI：10.7566/JPSJ.94.073602