Soft longitudinal modes in spin-singlet
- 1 July 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 50 (2) , 1278-1281
- https://doi.org/10.1103/physrevb.50.1278
Abstract
We present results from a neutron-scattering study of lattice anomalies associated with the transition to the gapped spin-singlet state observed in the spin-1/2 linear-chain compound . Instead of the lattice dimerization along the chain direction (c axis) expected for a spin-Peierls system, we observe a remarkable softening of the longitudinal acoustic phonons in a direction (along the b axis) perpendicular to the chains. A spontaneous strain appears in the same direction below the magnetic transition temperature of 14 K.
Keywords
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