Phase‐Change Materials: Vibrational Softening upon Crystallization and Its Impact on Thermal Properties

• DOI: 10.1002/adfm.201002274
• Publication Date: 2011-04-26T09:22:29Z
• Authors: Toshiyuki Matsunaga; Noboru Yamada; Rie Kojima; Shinichi Shamoto; Masugu Sato; Hajime Tanida; Tomoya Uruga; Shinji Kohara; Masaki Takata; Peter Zalden; Gunnar Bruns; Ilya Sergueev; Hans Christian Wille; Raphaël Pierre He...; Matthias Wuttig
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract Crystallization of an amorphous solid is usually accompanied by a significant change transport properties, such as increase in thermal and electrical conductivity. This fact underlines the importance crystalline order for charge heat. Phase‐change materials, however, reveal remarkably low conductivity state. The small this upon crystallization points to unique lattice properties. present investigation reveals that properties state phase‐change materials show remarkable differences higher displacements more pronounced anharmonic behavior phase. These findings are related bonding crystallization, which leads sound velocity softening optical phonon modes at same time.