Ultrasonic attenuation in cuprate superconductors

Pramana

T Gupta1¹  D M Gaitonde1¹ 

[1] Harish-Chandra Research Institute, Allahabad 211 019, India$$

关键词: Ultrasonic attenuation;    cuprates;    superconductivity.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

We calculate the longitudinal ultrasonic attenuation rate (UAR) in clean d-wave superconductors in the Meissner and the mixed phases. In the Meissner phase we calculate the contribution of previously ignored processes involving the excitation of a pair of quasi-holes or quasi-particles. There is a contribution ∝ 𝑇 in the regime 𝑘B𝑇 ≪ 𝑄𝑣F ≪ 𝛥0 and a contribution ∝ 1/𝑇 in the regime 𝑄𝑣F ≪ 𝑘B𝑇 ≪ 𝛥0. We find that these contributions to the UAR are large and cannot be ignored. In the mixed phase, using a semi-classical description, we calculate the electronic quasi-particle contribution to the UAR which at very low 𝑇, has a 𝑇 independent term proportional to $sqrt{H}$.

【 授权许可】

Unknown