Revival of the spin-Peierls transition in Cu_xZn_(1-x)GeO_3 under pressure
M. Fischer, P.H.M. van Loosdrecht, P. Lemmens, G. G\"untherodt, (RWTH-Aachen), B. B\"uchner, T. Lorenz, M. Breuer (Univ. zu K\"oln), J., Zeman, G. Martinez (GHMFL, Grenoble), G. Dhalenne, A. Revcolevschi (Univ., Paris-Sud)
TL;DR
This study investigates how hydrostatic pressure enhances the spin-Peierls transition temperature in Cu_xZn_(1-x)GeO_3, revealing a significant pressure effect linked to magnetic frustration and substitution effects.
Contribution
It demonstrates the revival of the spin-Peierls transition under pressure in Cu_xZn_(1-x)GeO_3, highlighting the role of magnetic frustration and substitution in this phenomenon.
Findings
Pressure increases the transition temperature significantly.
The pressure coefficient is nearly doubled compared to the pure compound.
Magnetic frustration decreases spin-spin correlation length.
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.
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