Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?

Details Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states? Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?

2001-07-14

arxiv.org/abs/cond-mat/0107319v1

Phys. Rev. B, 2002, 1 April

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 13 Postscript figures

Scientific paper

10.1103/PhysRevB.65.144303

We report high resolution polarized infrared studies of the quarter-filled spin ladder compound alpha'-NaV_2O_5 as a function of temperature (5K <= T <= 300K). Numerous new modes were detected below the temperature T_c=34K of the phase transition into a charge ordered nonmagnetic state accompanied by a lattice dimerization. We analyse the Brillouin zone (BZ) folding due to lattice dimerization at T_c and show that some peculiarities of the low-temperature vibrational spectrum come from quadruplets folded from the BZ point (1/2, 1/2, 1/4). We discuss an earlier interpretation of the 70, 107, and 133cm-1 modes as magnetic bound states and propose the alternative interpretation as folded phonon modes strongly interacting with charge and spin excitations.

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