Temperature Dependence of the Spin-Peierls Energy Gap and Anomalous Line Shapes in CuGeO$_3$

Details Temperature Dependence of the Spin-Peierls Energy Gap and Anomalous Line Shapes in CuGeO$_3$ Temperature Dependence of the Spin-Peierls Energy Gap and Anomalous Line Shapes in CuGeO$_3$

1996-03-27

arxiv.org/abs/cond-mat/9603174v1

Phys. Rev. B 53, R14713 1996.

Physics

Condensed Matter

10 pages, RevTeX, 6 postscript figures included, also available from http://insti.physics.sunysb.edu/~mmartin/pubs.html

Scientific paper

10.1103/PhysRevB.53.R14713

Neutron scattering measurements on a large single crystal of CuGeO$_3$ have been used to determine the temperature-dependence of the spin-Peierls energy gap. While the power law behavior of the intensity of structural superlattice peaks is well fit by $I({\rm T})\propto ({\rm T}_c - {\rm T})^{2\beta}$ with an exponent of $\beta =0.33$, the exponent for the temperature dependence of the energy gap is significantly smaller than expected for conventional spin-Peierls materials. Usual scaling relations relate the energy gap to the superlattice reflection intensity as $\Delta({\rm T}) \propto I^a$ with $a=1/3$; the present results suggest an exponent of $a\approx 1/6$ for CuGeO$_3$. Additional scattering cross-section is observed in constant-$q$ and constant-$E$ scans creating a long `tail' extending to higher energies relating to a proposed scattering continuum.

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