2025/12/10 by Solovjov, A. L., Bludova, L. V., Shytov, M. V. +3
Physics and Astronomy · #Conductivity #Crystal (programming language) #Doping #Electrical resistivity and conductivity #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Pseudogap #Rare-earth and actinide compounds #Single crystal #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys
paper · open access · doi:10.48550/arxiv.2512.09789
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2025/12/10 · openalex created_date 2025/12/12 · openalex updated_date 2026/07/28
The temperature dependences of both fluctuation conductivity (FLC) σ^′(T) and pseudogap (PG) Δ^*(T) derived from measurements of resistivity ρ(T) of an optimally doped YBa2Cu3O7-δ single crystal subjected to long-term storage have been studied. The as-grown sample S1 exhibits characteristics typical of optimally doped YBa2Cu3O7-δ single crystals containing twins and twin boundaries. Analysis of both FLC and PG showed an unexpected improvement in all characteristics of the sample after 6 years of storage (sample S2), indicating that the effect of twin boundaries is somehow limited. After 17 years of storage, all characteristics of the sample changed dramatically, which indicates a strong influence of internal defects formed during the aging process. For the first time, the temperature dependences of both FLC and PG were obtained after 17 years of storage.