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

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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.
7 pages, 8 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/95148

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0506203
 http://arxiv.org/abs/cond-mat/0506203
 Phys. Rev. B 72, 125127 (2005)
 doi:10.1103/PhysRevB.72.125127

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arXiv