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Fermi-surface analysis of a quasi-two-dimensional monophosphate tungsten bronze

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Roca, L. y Mascaraque Susunaga, Arantzazu y Avila, J. y Drouard, S. y Guyot, H. y Asensio, M.C. (2004) Fermi-surface analysis of a quasi-two-dimensional monophosphate tungsten bronze. Physical Review B, 69 (7). ISSN 1098-0121

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URL Oficial: http://dx.doi.org/10.1103/PhysRevB.69.075114


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Resumen

The P4W8O32 compound is a member of the low-dimensional monophosphate tungsten bronzes family whose reduced dimensionality induces electronic instabilities such as charge-density waves (CDWs). We report here the direct mapping of the Fermi surface (FS) of this compound at room temperature using synchrotron-radiation angle-resolved photoemission. The recorded FS images confirm the superimposition of three nested sheets, as proposed by the hidden-nesting model. We found two well defined parallel stripes along the (Gamma Y) over bar direction as well as a crosslike feature. Moreover, the small FS splitting predicted by ab initio calculations was distinguished in the experimental data. To extract quantitative information on the CDW phase transitions, the values of the nesting vectors were also determined from the FS topology. The obtained values were in excellent agreement with existing tight-binding calculations, although the accord was even better with the recently published ab initio theoretical predictions.


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© 2004 The American Physical Society.
We thank O. Pérez and Ph. Labbé for providing us with monophosphate tungsten bronzes single crystals. This work was financed by the Spanish ‘‘Ministerio de Ciencia y Tecnología’’ under Grant No. MAT2002-03431. A.M. acknowledges ‘‘Ministerio de Educacion y Cultura’’ and L.R. acknowledges ‘‘Ministerio de Ciencia y Tecnología’’ (Grants Nos. PF 00 51683701 and ES2001-0106, respectively) for financial support.

Palabras clave:Density-wave instability, Transition-metal oxides, (PO_2)_(4)(WO_3)(2m), Conductors, Graphite, Family, M=4
Materias:Ciencias > Física > Física de materiales
Código ID:28354
Depositado:16 Feb 2015 11:46
Última Modificación:16 Feb 2015 11:46

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