Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl

Details Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl

2005-06-08

arxiv.org/abs/cond-mat/0506203v2

Phys. Rev. B 72, 125127 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 8 figures

Scientific paper

10.1103/PhysRevB.72.125127

We have studied the electronic structure of the spin-1/2 quantum magnet TiOCl by polarization-dependent momentum-resolved photoelectron spectroscopy. From that, we confirm the quasi-one-dimensional nature of the electronic structure along the crystallographic b-axis and find no evidence for sizable phonon-induced orbital fluctuations as origin for the non-canonical phenomenology of the spin-Peierls transition in this compound. A comparison of the experimental data to our own LDA+U and Hubbard model calculations reveals a striking lack of understanding regarding the quasi-one-dimensional electron dispersions in the normal state of this compound.

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