Revival of the spin-Peierls transition in Cu_xZn_(1-x)GeO_3 under pressure

Details Revival of the spin-Peierls transition in Cu_xZn_(1-x)GeO_3 under pressure Revival of the spin-Peierls transition in Cu_xZn_(1-x)GeO_3 under pressure

1997-12-12

arxiv.org/abs/cond-mat/9712136v1

Phys. Rev. B57, p.7749-7754 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

LaTeX, 15 pages, 5 eps figures, Phys. Rev. B, to appear

Scientific paper

10.1103/PhysRevB.57.7749

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.

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