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Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states? | | M. N. Popova
; A. B. Sushkov
; S. A. Klimin
; E. P. Chukalina
; B. Z. Malkin
; M. Isobe
; Yu. Ueda
; | | Date: |
14 Jul 2001 | | Journal: | Phys. Rev. B, 2002, 1 April | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | 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. | | Source: | arXiv, cond-mat/0107319 | | Services: | Forum | Review | PDF | Favorites | |
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