Temperature and magnetic-field dependence of the lattice constant in the spin-Peierls cuprate CuGeO3sstudied by capacitance dilatometry in fields up to 16 T
T. Lorenz, U. Ammerahl, T. Auweiler, B. Büchner, A. Revcolevschi, G. Dhalenne
DOI 10.1103/PhysRevB.55.5914 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We present high-resolution measurements of the thermal-expansion coefficient and the magnetostriction along the a axis of CuGeO3 in magnetic fields up to 16 T. 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 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.
Similar papers
Effect of cobalt doping on the magnetic properties of the spin-Peierls cuprate CuGeO3
similarity 0.89P. E. Anderson et al.
Source status unknown — claims are unverified
Carrier concentration independent antiferromagnetic spin fluctuations in the electron-doped high-temperature superconducting cuprate Pr2−xCexCuO4
similarity 0.86G. V. M. Williams et al.
Source status unknown — claims are unverified
Band picture of the spin-Peierls cuprate CuGeO3
similarity 0.86Željko V. Šljivančanin et al.
Source status unknown — claims are unverified
Diamagnetism around the Meissner transition in a homogeneous cuprate single crystal
similarity 0.85Jesús Mosqueira et al.
Source status unknown — claims are unverified
Using Uniaxial Stress to Probe the Relationship between Competing Superconducting States in a Cuprate with Spin-stripe Order
similarity 0.85Z. Guguchia et al.
Source status unknown — claims are unverified
Superconductivity and magnetism of Sm1.85−xGdxCe0.15CuO4−δ and Gd2−yCeyCuO4−δ crystals
similarity 0.84Y. Nagata et al.
Source status unknown — claims are unverified