Ultrasonic and elastic properties of Tl- and Hg-Based cuprate superconductors: a review

作者：Abd Shukor R^*

来源：Phase Transitions, 2018, 91(1): 48-57.

DOI：10.1080/01411594.2017.1357181

• Ultrasonic attenuation
• elastic modulus
• internal friction
• sound velocity
• Debye temperature

This review is regarding the ultrasonic and elastic properties of Tl- and Hg-based cuprate superconductors. The objectives of this paper were to review the ultrasonic attenuation above the transition temperature T-c, and sound velocity and elastic anomalies at T-c in the Tl- and Hg-based cuprate superconductors. A discontinuity in the sound velocity and elastic moduli is observed near T-c for the Hg-based and other cuprate high temperature superconductor but not the Tl-based superconductor. Ultrasonic attenuation peaks are observed between 200 and 250 K in almost all Tl- and Hg-based cuprate superconductors reported. These peaks were attributed to lattice stepping and oxygen ordering in the Tl-O and Hg-O layers. Some Tl- and Hg-based superconductors show attenuation peak near T-c. However, this is not a common feature for the cuprate superconductors. The ultrasonic attenuation decrease rate below T-c is slower than that expected from a Bardeen-Cooper-Schrieffer (BCS) and pseudo-gapped superconductor.

• 出版日期2018