2021/05/19 by Ayesha Siddika Borna, Borna, Ayesha Siddika, R. S. Islam +3
Arts and Humanities · Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Medieval European Literature and History #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2105.08964
openalex publication_date 2021/05/19 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
This study focuses on the temperature and hole content dependent fluctuation diamagnetism of hole doped YBa2Cu3O7-delta (Y123) high-Tc superconductors. Two different compositions of Y123 have been considered with in-plane hole content (p): 0.161 (optimally doped) and 0.143 (underdoped). The fluctuation induced excess diamagnetic susceptibility, Deltachi(T), has been investigated via the mean-field Gaussian-Ginzburg-Landau (MFGGL) formalism with and without a total energy cut-off in the fluctuating modes. It has been found that inclusion of total energy cut-off describes the Deltachi(T) data significantly better. Furthermore, the pseudogap (PG) itself induces an anomalous decrease in the normal state magnetic susceptibility. By means of the analysis of Deltachi(T)/T at different hole concentrations, we have explored the possible role of the PG on diamagnetic fluctuations. It has been found that MFGGL formalism is not able to reproduce the Deltachi(T)/T features for the underdoped compound over a broad range of reduced temperature, Epsilon [= ln(T/Tc)]. The discrepancy becomes prominent in the temperature range where PG dominates the normal state magnetic susceptibility data. The agreement between the theoretical prediction and experimental Deltachi(T) is better for the optimally doped compound with p = 0.161, where the effect of the PG is small. This notable difference implies that PG induced reduction in the magnetic susceptibility is not related directly to the superconducting fluctuations which in turn indicate that electronic correlations giving rise to the PG and Cooper pairing are independent to each other.