Dielectric versus magnetic pairing mechanisms in high-temperature cuprate superconductors investigated using Raman scattering

Abstract

We suggest, and demonstrate, a systematic approach to the study of cuprate superconductors, namely, progressive change of ion size in order to systematically alter the interaction strength and other key parameters. R(Ba,Sr)${}_2$Cu${}_3$O${}_y$ (R={La, ... Lu,Y}) is such a system where potentially obscuring structural changes are minimal. We thereby systematically alter both dielectric and magnetic properties. Dielectric fluctuation is characterized by ionic polarizability while magnetic fluctuation is characterized by exchange interactions measurable by Raman scattering. The range of transition temperatures is 70 to 107 K and we find that these correlate only with the dielectric properties, a behavior which persists with external pressure. The ultimate significance may remain to be proven but it highlights the role of dielectric screening in the cuprates and adds support to a previously proposed novel pairing mechanism involving exchange of quantized waves of electronic polarization.

arXiv commentManuscript: 5 pages, 4 figures. Supplemental material included (9 pages, 5 figures)

References in corpus (16)

• A Common Thread: the pairing interaction for the unconventional superconductors
• Band-structure trend in hole-doped cuprates and correlation with Tcmax
• Effect of chemical inhomogeneity in the bismuth-based copper oxide superconductors
• Intense paramagnon excitations in a large family of high-temperature superconductors
• Superconductivity and the Pseudogap in the two-dimensional Hubbard model
• Measurement of magnetic excitations in the two-dimensional antiferromagnetic Sr2CuO2Cl2 insulator using resonant x-ray scattering:Evidence for extended interactions
• What the resonance peak cannot do
• Resonant two-magnon Raman scattering in parent compounds of high-T${}_c$ superconductors.
• The Superconducting Condensation Energy and an Antiferromagnetic Exchange Based Pairing Mechanism
• A magnetic analog of the isotope effect in cuprates
• Relation between the superconducting gap energy and the two-magnon Raman peak energy in Bi2Sr2Ca{1-x}YxCu2O{8+δ}
• Bosonic Spectral Function and The Electron-Phonon Interaction in HTSC Cuprates
• The nodal gap component as a good candidate for the superconducting order parameter in cuprates
• Signatures of Fermi surface reconstruction in Raman spectra of underdoped cuprates
• Optimal T${}_c$ of cuprates: role of screening and reservoir layers
• The pseudogap ground state in high temperature superconductors

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• Dynamically screened Coulomb interaction in the parent compounds of hole-doped cuprates, trends and exceptions
• Effective-field theory for high-$T_c$ cuprates
• Model of charge triplets for high-T${}_c$ cuprates
• Relation between cuprate superconductivity and magnetism: A Raman study of (CaLa)(BaLa)${}_2$Cu${}_3$O${}_y$
• Magnon Splitting Induced by Charge Transfer in the Three-Orbital Hubbard Model
• A picture of pseudogap phase related to charge fluxes
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• Relevance of magnetism to cuprate superconductivity: Lanthanides versus charge-compensated cuprates
• On the intrinsic pinning and shape of charge-density waves in 1D Peierls systems
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