Effect of the local substitution of Li for Cu on the electronic structure of YBa2Cu3O7

The Y 1-x Li x Ba 2 Cu 3 O 7-δ polycrystalline bulk superconductors doped with Li substituting at the Y site at different concentrations (x = 0, 0.01, 0.02, 0.1) were prepared using the citrate-gel method to study the effects of doping on the superconducting temperature and critical current density. The question was whether Li addition characterized by a high Debye frequency would have any positive effects on T c . The optimum citrate-gel and heat treatment conditions were identified as those yielding samples with a maximum grain size on the order of 50 μm (up to the optimum Li doping level, x = 0.01). Li substitution at the Y site was verified by structural, electrical, and magnetic measurements of the produced samples, whereas X-ray diffraction (XRD) analysis revealed the formation of a pure phase with no visible impurity phases. Moreover, AC magnetic susceptibility measurements showed no increase in the superconducting transition temperature T c , consistent with the predicted results obtained by machine learning method, although it was theoretically expected to increase owing to the high Debye frequency of Li. This observation is consistent with magnetic coupling models for pairing mechanism in cuprates. Finally, because of the optimum conditions of the preparation procedure, nearly identical values of the critical current density (J c ) were recorded for samples with different Li doping levels (up to the optimum Li doping level). It was found that improved compound preparation conditions would have a critical and extensive effect on J c enhancement, with nearly no T c suppression.

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Effects of li doping on superconducting properties of citrate-gel prepared Y1–xLixBa2Cu3O7–δ Compound

Amiri–Moghadam

Gashmard²,

Hosseini³

et al. 2022

Appl. Phys. A

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A theoretical study of anomalous elastic behaviour of Na-doped Y-1-2-3 high-Tc superconductor

Reddy

Reddi

Venugopal

1994

Physica C: Superconductivity

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Local structural changes in lithium-doped YBa2Cu3Oy

Maury

Nicolas-Francillon

Bourée

et al. 2000

Physica C: Superconductivity

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Effect of the local substitution of Li for Cu on the electronic structure of YBa2Cu3O7

Cited by 8 publications

References 26 publications

Effects of li doping on superconducting properties of citrate-gel prepared Y1–xLixBa2Cu3O7–δ Compound

Effects of li doping on superconducting properties of citrate-gel prepared Y1–xLixBa2Cu3O7–δ Compound

A theoretical study of anomalous elastic behaviour of Na-doped Y-1-2-3 high-Tc superconductor

Local structural changes in lithium-doped YBa2Cu3Oy

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