Spectroscopic fingerprints of the frustrated magnetic order in Li2VOSi4: a t-J model study

I. J. HAMAD; A. E. TRUMPER; L. O. MANUEL

PHYSICA B - CONDENSED MATTER

Elsevier

Lugar: Amsterdam; Año: 2007 vol. 398 p. 416 - 420

0921-4526

We have analyzed theoretically the photoemission spectra of the insulating compound Li2VOSiO4. Recently, this compound has been proposed as the first experimental realization of the frustrated J1-J2 Heisenberg model. Although it is well known that Li2VOSiO4 is magnetically ordered in a collinear arrangement below TN ~ 2.8K, there is some controversy about the coexistence of two collinear phases above TN. Using a generalized t-J model we have obtained a complex spectral structure that can be traced back to the underlying collinear magnetic structures. We discuss the possibility to use ARPES experiments as a way to discern among the different scenarios proposed in the literature.