Hydrostatic pressure effect on the pseudogap in Y0.77Pr0.23Ba2Cu3O7–δ single crystals
Вплив гідростатичного тиску на псевдощілину в монокристалах Y0.77Pr0.23Ba2Cu3O 7–δ
Solovjov A.L. Bludova L.V. Kolesnik A.S. Petrenko E.V. Shytov N.V. Sedda A. Lähderanta E. Sergeyev D. Vovk R.V.
25 February 2026B.Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine
Fizika Nizkikh Temperatur
2026#52Issue 4475 - 487 pp.
Significant efforts have been made to elucidate the properties of high-temperature superconductors (HTSCs) using hydrostatic pressure (HP). We studied the changes of resistivity ρ(T), superconduting transition tempetature Tc, fluctuation conductivity σ′(T), and pseudogap Δ*(T) of Y1−хPrxBa2Cu3O7 −d (YPrBCO) (x=0.23) single crystal under HP up to ∼1.1 GPa. Defects created by magnetic inclusions of PrBa2Cu3O7–δ (PrBCO) were found to play a significant role in the behavior of the sample. The largest decrease in ρ(T) was found depending on HP at a rate of d ln ρ(100 K)/dP=– (29 ± 0.2) %·GPa–1. This indicates that the mechanisms of the influence of HP on the ρ(T) and Tc of YPrBCO and YBa2Cu3O7–δ single crystals are different. From the analysis of the pseudogap, it was revealed that the mechanism of the interaction of charge carriers with magnetic PrBCO impurities changes three times with increasing HP. Relatively low HP, up to ~ 0.5 GPa, promotes the formation of defects caused by PrBCO magnetic inclusions. Starting from 0.6 GPa, the HP neutralizes the influence of magnetic impuri-ties, and the magnetic maximum on Δ*(T) disappears. Above ~ 1.0 GPa, HP aligns the magnetic moments of PrBCO, and the magnetic maximum reappears on Δ*(T), more pronounced than at P=0. Comparison with the Peters–Bauer theory showed that the local pair density in HTSC does indeed increase with increasing pressure.
fluctuation conductivity , high-temperature superconductors , praseodymium doping , pseudogap , resistivity , superconducting transition temperature
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B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkiv, 61103, Ukraine
Department of Physics, LUT University, Lappeenranta, 53850, Finland
Institute for Low Temperatures and Structure Research of PAS, Wroclaw, 50-422, Poland
Physics Department, V. N. Karazin Kharkiv National University, Kharkiv, 61022, Ukraine
K. Zhubanov Aktobe Regional University, Aktobe, 030000, Kazakhstan
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Department of Physics
Institute for Low Temperatures and Structure Research of PAS
Physics Department
K. Zhubanov Aktobe Regional University
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