Thermodynamic Properties of the Incommensurate Phase of CuGeO_3

Details Thermodynamic Properties of the Incommensurate Phase of CuGeO_3 Thermodynamic Properties of the Incommensurate Phase of CuGeO_3

1996-10-22

arxiv.org/abs/cond-mat/9610163v1

Phys. Rev. B 54, 15610 (1996)

Physics

Condensed Matter

12 pages (Latex), 4 Figs. (PS), to appear in Phys. Rev. B54 (Vol.21)

Scientific paper

10.1103/PhysRevB.54.R15610

We present high resolution measurements of the specific heat and the thermal expansion of the inorganic spin--Peierls cuprate CuGeO_3 in a magnetic field of 16 Tesla. At the transition from the incommensurate to the uniform phase both quantities show pronounced anomalies, which allow to derive the uniaxial pressure dependencies of the transition temperature. In high magnetic fields the specific heat is dominated by magnetic excitations and follows a T^3 law at low temperatures. The thermal expansion measurements show the occurrence of spontaneous strains along all three lattice constants and yield high resolution measurements of the temperature dependence of the incommensurate structural distortion. The sizes of the spontaneous strains in the incommensurate phase are significantly reduced, but both their anisotropy as well as their temperature dependencies are very similar to those in zero field.

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