Abstract
The magnetic-phase diagram of ${\mathrm{Cu}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Zn}}_{\mathrm{x}}$${\mathrm{GeO}}_{3}$ crystals is obtained with an ultrasonic velocity measurement. As the concentration x is increased both a limited spin-Peierls (SP) order and an antiferromagnetic (AF) order are observed. The AF state is identified through an additional elastic anomaly: its symmetry is orthorhombic with the easy axis along the chain direction. The SP state is clearly identified via a well-defined anomaly at low concentrations only: it is, however, revealed by pretransitional elastic fluctuations for all crystals. From the general aspect of the magnetic phase diagram, we establish that there is coexistence of the SP and AF order at low temperatures.
Published Version
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