Optical studies of gap, exchange, and hopping energies in the insulating cuprates
S. L. Cooper, G. A. Thomas, A. J. Millis, P. E. Sulewski, J. Orenstein, D. H. Rapkine, S-W. Cheong, P. L. Trevor
DOI 10.1103/PhysRevB.42.10785 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We have measured the insulating energy gap Δ and the exchange interaction J in a series of cuprate crystals, including T’-phase M2CuO4 (M=Pr, Nd, Sm, Eu, and Gd), T*-phase La,Tb,Sr2CuO4, and T-phase La2CuO4. We find that the energy gap scales predominantly with the in-plane Cu-O distance, scaling as δ logΔ/ δ logd∼-6. Furthermore, contrary to simple expectations, the energy gap increases with decreasing Cu-O distance, suggesting that Coulomb and other repulsive energies dominate the effects of band hybridization. Using a three-band Hubbard-model expression, our studies of Δ and J in the cuprates allow us to estimate that the hopping energy t scales with Cu-O distance as δ logt/δ logd∼-4.
Similar papers
Universal versus Material-Dependent Two-Gap Behaviors of the High-Tc Cuprate Superconductors: Angle-Resolved Photoemission Study of La2−xSrxCuO4
similarity 0.88T. Yoshida et al.
Source status unknown — claims are unverified
Near-band gap electronic structure of the tetragonal rare-earth cuprates R2CuO4 and the bismuth cuprate Bi2CuO4
similarity 0.88R. V. Pisarev et al.
Source status unknown — claims are unverified
Momentum-resolved charge excitations in high-Tc cuprates studied by resonant inelastic x-ray scattering
similarity 0.86K. Ishii et al. · 2007 · arXiv:0708.3534
Source status unknown — claims are unverified
Thermal conductivity across the phase diagram of cuprates: Low-energy quasiparticles and doping dependence of the superconducting gap
similarity 0.86Mike Sutherland et al.
Source status unknown — claims are unverified
Gap structure and phase diagram of twisted bilayer cuprates from a microscopic perspective
similarity 0.86Siddhant Panda et al. · 2026 · arXiv:2603.10865
Source status unknown — claims are unverified
Parameters of the Effective Singlet-Triplet Model for Band Structure of High- Cuprates by Different Approaches
similarity 0.86M. M. Korshunov et al. · 2004 · arXiv:cond-mat/0402401
Source status unknown — claims are unverified