Spectroscopic fingerprints of the frustrated magnetic order in Li2VOSiO4

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

Dresden, Alemania

Workshop; Strong Correlations and Angle - Resoloved Photoemission Spectroscopy; 2007

Max Planck Institute for The Physics of Complex Systems

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