Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-01-12
Phys. Rev. B vol. 61, 15185 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 4 figures
Scientific paper
10.1103/PhysRevB.61.15185
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.
Isobe Masaharu
Konstantinovic Milan J.
Popovic Z. V.
Ueda Yohei
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