1. Elastic stiffness of single-crystalline FeSe measured by picosecond ultrasonics.
- Author
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Wen, Yu-Chieh, Liao, Yang-Chung, Chang, Hsian-Hong, Mok, Boon-How, Lee, Yung-Chi, Huang, Tzu-Wen, Yeh, Kuo-Wei, Luo, Jiu-Yong, Wang, Ming-Jye, Sun, Chi-Kuang, and Wu, Maw-Kuen
- Subjects
SUPERCONDUCTING composites ,PICOSECOND pulses ,SUPERCONDUCTORS ,ULTRASONICS ,THIN films ,X-ray diffraction ,PHONONS - Abstract
We report investigations on the elasticity of superconducting FeSe using picosecond ultrasonic technique. The tetragonal (001) FeSe thin film, deposited on a processed SrTiO3 substrate by the pulsed laser deposition, exhibits distinct c-axis preferred orientation and single-crystalline features as a result of the x-ray diffraction. The high-quality crystallinity thus enables quantitative examinations of anisotropic stiffness coefficients (C33) of FeSe, correlating to the interatomic interaction in the simplest iron-based superconductor. Our experiment indicates a room-temperature C33 of 40.9 ± 0.4 GPa and material stiffening of 4.3% at low temperatures, which can be explained by the weakening of anharmonic phonon-phonon interactions. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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