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Experimental electronic structure and Fermi-surface instability of the correlated 3d sulphide BaVS_3

The correlated $3d$ sulphide BaVS_3 exhibits an interesting coexistence of one-dimensional and three-dimensional properties. Our experiments determine the electronic band structure and shed new light on this puzzle. High-resolution angle-resolved photoemission measurements in a 4-eV wide range below the Fermi energy level uncover and investigate the coexistence of a_{; ; ; ; ; ; ; 1g}; ; ; ; ; ; ; wide-band and e_g narrow-band d-electrons that lead to the complicated electronic properties of this material. We explore the effects of strong correlations and the Fermi surface instability associated with the metal-insulator transition.

ARPES ; bad metals ; PACS numbers ; 71.30.h ; 71.45.Lr ; 79.60.i

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