Physics – Condensed Matter – Superconductivity
Scientific paper
1999-12-03
aceepted for publication in PRB Feb. 2000
Physics
Condensed Matter
Superconductivity
6 pages, 9 figures
Scientific paper
10.1103/PhysRevB.61.6126
Single crystals of the spin-gap system $\rm (VO)_2P_2O_7$ have been investigated by means of Raman scattering. At temperatures below T=75 K~$\approx 2\Delta_{01}({\bf k}=0)$, with $\Delta_{01}$ the singlet-triplet gap, a shoulder appears at 47 cm$^{-1}$. An analysis of the polarization selection rules and the temperature dependence of the scattering intensity leads to its identification as a singlet bound state with very small binding energy. Therefore in contrast to recent theoretical models the importance of frustration for this compound must be rejected. The observation of a strong anharmonicity of three phonons with energies close to $\Delta_{01}$ at the zone boundary and additional quasielastic light scattering, however, both point to a strong spin-phonon coupling in this system. We propose this coupling to be the origin of the second bound triplet state observed in recent neutron scattering experiments.
Assmus Wolf
Büllesfeld F.
Grove Marty
Güntherodt Gernot
Lemmens Peter
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