Low-energy excitations in NaV2O5

Details Low-energy excitations in NaV2O5 Low-energy excitations in NaV2O5

2001-03-21

arxiv.org/abs/cond-mat/0103453v1

Phys.Rev.B 65, 12404 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.65.012404

In the (ab) polarized Raman scattering spectra of NaV2O5 single crystals, measured with 647.1 nm laser line at T < Tc, we found two modes at 86, and 126 cm-1 not previously reported. These two modes, together with 66, and 106 cm-1 modes, make an array of four low-energy equidistant modes below the energy onset of the continuum at about 132 cm-1. All four modes are strongly suppressed by increasing Na deficiency, indicating their nonvibrational origin and the existence of a quantum phase transition at critical Na deficiency between 3 and 4%. These results question current understanding of NaV2O5 as quasi one-dimensional Heisenberg antiferromagnet.

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