Revival of the spin-Peierls transition in Cu_xZn_(1-x)GeO_3 under pressure
arXiv:cond-mat/9712136 · doi:10.1103/PhysRevB.57.7749
Abstract
Pressure and temperature dependent susceptibility and Raman scattering experiments on single crystalline Cu_xZn_(1-x)GeO_3 have shown an unusually strong increase of the spin-Peierls phase transition temperature upon applying hydrostatic pressure. The large positive pressure coefficient (7.5 K/GPa) - almost twice as large as for the pure compound (4.5 K/GPa) - is interpreted as arising due to an increasing magnetic frustration which decreases the spin-spin correlation length, and thereby weakens the influence of the non-magnetic Zn-substitution.
LaTeX, 15 pages, 5 eps figures, Phys. Rev. B, to appear