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Temperature and magnetic field dependence of the lattice constant in spin-Peierls cuprate CuGeO_3 studied by capacitance dilatometry in fields up to 16 Tesla | | T. Lorenz
; U. Ammerahl
; T. Auweiler
; B. Büchner
; A. Revcolevschi
; G. Dhalenne
; | | Date: |
23 Oct 1996 | | Journal: | Phys. Rev. B 55, 5914 (1997) | | Subject: | cond-mat | | Affiliation: | II. Phys. Inst., Univ. Köln), A. Revcolevschi and G. Dhalenne (Lab. Ch. Sol., Univ. Paris-Sud | | Abstract: | We present high resolution measurements of the thermal expansion coefficient and the magnetostriction along the a-axis of CuGeO_3 in magnetic fields up to 16 Tesla. From the pronounced anomalies of the lattice constant a occurring for both temperature and field induced phase transitions clear structural differences between the uniform, dimerized, and incommensurate phases are established. A precise field temperature phase diagram is derived and compared in detail with existing theories. Although there is a fair agreement with the calculations within the Cross Fisher theory, some significant and systematic deviations are present. In addition, our data yield a high resolution measurement of the field and temperature dependence of the spontaneous strain scaling with the spin-Peierls order parameter. Both the zero temperature values as well as the critical behavior of the order parameter are nearly field independent in the dimerized phase. A spontaneous strain is also found in the incommensurate high field phase, which is significantly smaller and shows a different critical behavior than that in the low field phase. The analysis of the temperature dependence of the spontaneous strain yields a pronounced field dependence within the dimerized phase, whereas the temperature dependence of the incommensurate lattice modulation compares well with that of the dimerization in zero magnetic field. | | Source: | arXiv, cond-mat/9610171 | | Services: | Forum | Review | PDF | Favorites | |
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