G. A. Zvyagina, T. N. Gaydamak, K. R. Zhekov, I. V. Bilich, V. D. Fil, D. A. Chareev, A. N. Vasiliev
The results of the comprehensive ultrasonic research of high quality single crystals of FeSe are presented. Absolute values of sound velocities and their temperature dependences were measured; elastic constants and Debye temperature were calculated. The elastic C11-C12 and C11 constants undergo significant softening under the structural tetra-ortho transformation. The significant influence of the superconducting transition on the velocity and attenuation of sound was revealed and the value of the superconducting energy gap was estimated.
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http://arxiv.org/abs/1303.4948
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