Superconducting Properties of High-Temperature Cuprates
Summary
High-temperature cuprate superconductors occupy a central role in condensed-matter physics owing to their layered perovskite structures, strong anisotropy and unconventional pairing mechanisms. These materials, typified by copper-oxide planes separated by charge-reservoir layers, exhibit superconductivity at transition temperatures (Tc) far above those of conventional metallic alloys. Superconductivity arises upon carrier doping of antiferromagnetic parent compounds, giving rise to a dome-shaped phase diagram that includes pseudogap and strange-metal regimes. The superconducting state is characterised by a short coherence length, high upper critical fields and d-wave pairing symmetry, all of which contribute to pronounced thermal and magnetic fluctuation effects. Flux pinning within the CuO2 planes and at defect sites determines the critical current density, making microstructural control essential for applications. Advances in spectroscopy and transport measurements have clarified the interplay between charge order, spin excitations and superconducting condensate, suggesting that coupling via spin fluctuations may drive pairing. Despite consensus on the d-wave order parameter, the precise mechanism of pairing remains under active investigation. Practical implementations leverage these properties for high-field magnets, power transmission cables and fault-current limiters, while ongoing efforts aim to improve material homogeneity and reduce anisotropy to unlock further technological potential.
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Superconducting Properties of High-Temperature Cuprates publication trend
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Technical terms
d-wave pairing: A superconducting order parameter symmetry in which the amplitude changes sign under 90° rotation, giving rise to nodal lines in the energy gap.
Pseudogap: A partial suppression of electronic density of states above Tc, indicative of competing order or precursor pairing correlations.
Flux pinning: Immobilisation of magnetic vortices by defects or inhomogeneities, essential for sustaining high critical currents in the superconducting state.
Coherence length: The characteristic size over which the superconducting order parameter varies, governing vortex core dimensions and anisotropy effects.
Charge-reservoir layer: Structural block that donates charge carriers to CuO2 planes, whose composition and thickness critically influence Tc and anisotropy.
References
- Elemental Substitution at Tl Site of Tl1−xXx(Ba, Sr)CaCu2O7 Superconductor with X = Cr, Bi, Pb, Se, and Te. Materials (2023).
- Effect of co-substitution on superconductivity in (Y, Ca)(Ba, Sr) 2 Cu 4 O 8 prepared by the molten KOH method. Journal of Physics Conference Series (2021).
- Superconductivity Measurements of (Hg,Tl)-1223 Compound Prepared in Capsule. Iraqi Journal of Science (2021).
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