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Raman Scattering from Magnetic Excitations in the Spin Ladder Compounds CaV2O5 and MgV2O5 | | M.J.Konstantinovic
; Z.V.Popovic
; M.Isobe
; Y.Ueda
; | | Date: |
12 Dec 1999 | | Journal: | Phys. Rev. B vol. 61, 15185 (2000) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We present the Raman-scattering spectra of CaV2O5 and MgV2O5. The magnetic contribution in the Raman spectra of CaV2O5 is found in the form of a strong asymmetric line, centered at 2Delta, with a tail on the high-energy side. Our analysis of its spectral shape shows that the magnetic ordering in CaV2O5 can be described using a S=1/2 two-leg ladder Heisenberg antiferromagnetic model with Jparallel/Jperp = 0.1, and a small interladder exchange. The spin gap and exchange constant are estimated to be Delta = 400 cm-1 (570 K) and Jperp = 640 K. No magnon bound states are found. In contrast to CaV2O5 the existence of the spin-gap is not confirmed in MgV2O5, since we found no feature in the spectra which could be associated with the onset of the two-magnon continuum. Instead, we observe two-magnon excitation at 340 cm-1, presumably related to the top of the two-magnon brunch. | | Source: | arXiv, cond-mat/0001168 | | Services: | Forum | Review | PDF | Favorites | |
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