One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr

Abstract

We have performed a comparative study of the electronic structures of the spin-Peierls systems TiOCl and TiOBr by means of photoemission spectroscopy and density functional calculations. While the overall electronic structure of these isostructural compounds is qualitatively similar, the bromide appears to be less one-dimensional. We present a quantitative analysis of the experimental dispersions in terms of exchange constant J and hopping integral t as well as a discussion of the qualitative spectral features. From that we conclude that despite the one-dimensional physics triggering the ground state in both compounds a proper description of the normal state electronic structure has to take into account the anisotropic frustrated interchain interactions on the underlying triangular lattice.

5 pages, 4 figures

References in corpus (4)

• Incommensurate interactions and non-conventional spin-Peierls transition in TiOBr
• Heat capacity of the quantum magnet TiOCl
• Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl
• Spin dynamics in the low-dimensional magnet TiOCl

Cited by in corpus (4)

• Electronic structure of the two-dimensional Heisenberg antiferromagnet VOCl: a multi-orbital Mott insulator
• Density functional study of the electronic and vibrational properties of TiOCl
• Cluster Dynamical Mean-field calculations for TiOCl
• Momentum-resolved single-particle spectral function for TiOCl from a combination of density functional and variational cluster calculations