Volume 101, Number 5, March 2013
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||21 March 2013|
Acoustic characteristics of FeSe single crystals
1 B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., 61103, Kharkov, Ukraine
2 Institute of Experimental Mineralogy - 142432, Chernogolovka, Moscow Region, Russia
3 Low Temperature Physics and Superconductivity Department, Moscow State University - 119991, Moscow, Russia
Received: 13 November 2012
Accepted: 14 February 2013
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.
PACS: 62.65.+k – Acoustical properties of solids / 74.25.Ld – Mechanical and acoustical properties, elasticity, and ultrasonic attenuation
© EPLA, 2013
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