Acoustic characteristics of FeSe single crystals Acoustic characteristics of FeSe single crystals

Abstract

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.

arXiv comment5 pages, 7 figures, 1 table

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• Fermi surface, pressure-induced antiferromagnetic order, and superconductivity in FeSe
• Piezomagnetism of FeSe single crystals
• Magnetotransport properties of FeSe in fields up to 50T
• Variation of shear moduli across superconducting phase transitions
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• Multiband effect in elastoresistance of Fe(Se,Te)
• Phase separation near the charge neutrality point in FeSe${}_{1-x}$Te${}_x$ crystals with x $<$ 0.15
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