Magnetic interactions and the pressure phase-diagram of CuGeO3
P.H.M. van Loosdrecht (1,2), J. Zeman (1), G. Martinez(1), G. Dhalenne, (3), A. Revcolevschi (3). ((1) Grenoble High Magnetic Field Laboratory, (2), 2. Phys. Inst. RWTH-Aachen (3) Lab. Chim. Sol. Univ. Paris-Sud)
TL;DR
This study investigates how pressure and temperature influence the vibrational and spin properties of CuGeO3, revealing a new phase and supporting a model where next nearest neighbor interactions stabilize the spin-Peierls ground state.
Contribution
It presents a pressure-temperature phase diagram for CuGeO3 and quantifies the pressure dependence of key magnetic interactions and the spin-Peierls gap.
Findings
Identification of a new low temperature, high pressure phase.
Quantitative estimates of pressure effects on magnetic interactions.
Support for a model with next nearest neighbor interactions stabilizing the ground state.
Abstract
A pressure and temperature dependent Raman study of the vibrational and spin dynamics in CuGeO3 is presented. A new low temperature, high pressure phase has been identified, and a pressure-temperature phase-diagram is proposed for CuGeO3. The pressure dependence of the effective exchange interaction, of the spin-Peierls gap, and of the spin-Peierls temperature strongly supports a model in which next nearest neighbor interactions stabilise the SP ground state. The Raman data allow for a quantitative estimate of the pressure dependence of the next nearest neighbor interactions.
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