2001/03/21 by M.J. Konstantinović, M. J. Konstantinovic, J. C. Irwin +4
Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Energy (signal processing) #Inorganic Fluorides and Related Compounds #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Raman scattering #Raman spectroscopy #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.65.012404
published as Phys.Rev.B 65, 12404 (2002). · 6 pages, 3 figures
arxiv created 2001/03/21 · openalex publication_date 2001/11/30 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In the (ab)-polarized Raman scattering spectra of NaV2O5 single crystals, measured with a 647.1 nm laser line at T<Tc, we found two modes at 86 and 126 cm^\ensuremath-1 not previously reported. These two modes, together with 66 and 106 cm^\ensuremath-1 modes, make an array of four low-energy equidistant modes below the energy onset of the continuum at about 132 cm^\ensuremath-1. All four modes are strongly suppressed by increasing Na deficiency, suggesting a nonvibrational origin of the modes and the existence of a quantum phase transition at the critical Na deficiency between 3% and 4%. These results question our current understanding of NaV2O5 as a quasi-one-dimensional Heisenberg antiferromagnet.