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Magnetoelastic coupling and spin excitations in the spin-gap system (VO)$_2$P$_2$O$_7$: A Raman scattering study | | M. Grove
; P. Lemmens
; G. Güntherodt
; B. C. Sales
; F. Büllesfeld
; W. Assmus
; | | Date: |
3 Dec 1999 | | Journal: | aceepted for publication in PRB Feb. 2000 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Single crystals of the spin-gap system $
m (VO)_2P_2O_7$ have been investigated by means of Raman scattering. At temperatures below T=75 K~$approx 2Delta_{01}({f k}=0)$, 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. | | Source: | arXiv, cond-mat/9912050 | | Services: | Forum | Review | PDF | Favorites | |
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