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15 August 2020
 
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Low-energy excitations in NaV2O5
M. J. Konstantinovic ; J. C. Irwin ; M. Isobe ; Y. Ueda ;
Date 22 Mar 2001
Journal Phys.Rev.B 65, 12404 (2002).
Subject Strongly Correlated Electrons | cond-mat.str-el
AbstractIn 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.
Source arXiv, cond-mat/0103453
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