Elastic stiffness of single-crystalline FeSe measured by picosecond ultrasonics

We report investigations on the elasticity of superconducting FeSe using picosecond ultrasonic technique. The tetragonal (001) FeSe thin film, deposited on a processed SrTiO 3 substrate by the pulsed laser deposition, exhibits distinct c-axis preferred orientation and single-crystalline features as...

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Bibliographic Details
Published in:Journal of applied physics 2011-10, Vol.110 (7), p.073505-073505-4
Main Authors: 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, Wu, Maw-Kuen
Format: Article
Language:English
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Summary:We report investigations on the elasticity of superconducting FeSe using picosecond ultrasonic technique. The tetragonal (001) FeSe thin film, deposited on a processed SrTiO 3 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 ( C 33 ) of FeSe, correlating to the interatomic interaction in the simplest iron-based superconductor. Our experiment indicates a room-temperature C 33 of 40.9±0.4GPa and material stiffening of 4.3% at low temperatures, which can be explained by the weakening of anharmonic phonon-phonon interactions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3645058