Spin-Peierls transitions in magnetic donor-acceptor compounds of tetrathiafulvalene (TTF) with bisdithiolene metal complexes

Authors

I. S. Jacobs
J. W. Bray
H. R. Hart Jr.
L. V. Interrante
J. S. Kasper
G. D. Watkins
D. E. Prober
Jill C. Bonner, University of Rhode Island

Document Type

Article

Date of Original Version

10-1-1976

Abstract

The spin-Peierls transition is considered as a progressive spin-lattice dimerization occurring below a transition temperature in a system of one-dimensional antiferromagnetic Heisenberg chains. In the simplest theories, the transition is second order and the ground state is a singlet with a magnetic gap. The historical origins and theoretical development of the concept are examined. Magnetic susceptibility and EPR measurements on the π-donor-acceptor compounds TTF·MS₄C₄(CF₃)₄ (M=Cu, Au; TTF is tetrathiafulvalene) are reported. These compounds exhibit clearly the characteristics of the spin-Peierls transition in reasonably good agreement with a mean-field theory. The susceptibility of each compound has a broad maximum near 50 K, while the transitions occur at 12 and 2.1 K for M=Cu and Au, respectively. EPR linewidth observations over a broad temperature range are examined. Areas for further experimental and theoretical work are indicated, and a critical comparison is made of related observations on other materials.

Citation/Publisher Attribution

Jacobs, I. S., Bray, J. W., Hart, H. R., Interrrante, L. V., Kasper, J. S., Watkins, G. D., Prober, D. E., & Bonner, J. C. (1976). Phys. Rev. B, 14(7), 3036-3051. doi: 10.1103/PhysRevB.14.3036

Available at: http://dx.doi.org/10.1103/PhysRevB.14.3036