The unusual electronic structure of the "pseudo-ladder" compound CaCu2O3

Abstract

Experimental and theoretical studies of the unoccupied electronic structure of CaCu2O3 single crystals have been performed using polarization-dependent x-ray absorption spectroscopy and band structure calculations. The measured hole distribution shows an unusual large number of holes in orbitals parallel to the interlayer direction which is in agreement with the theoretical analysis. CaCu2O3 deviates significantly from the standard pd-sigma cuprate picture. The corresponding strong interlayer exchange is responsible for the missing spin gap generic for other two-leg ladder cuprates.

4 pages, 3 figures included

References in corpus (2)

• Quantum Phase Transition in Coupled Spin Ladders
• Effects of anisotropic spin-exchange interactions in spin ladders

Cited by in corpus (6)

• Optical study of orbital excitations in transition-metal oxides
• Magnetic heat conductivity in $\mathbf{CaC}{\mathbf{u}}_2{\mathbf{O}}_3$: linear temperature dependence
• Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling
• Orbital control of effective dimensionality: from spin-orbital fractionalization to confinement in the anisotropic ladder system CaCu2O3
• Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens
• High-field ESR studies of the quantum spin magnet CaCu2O3