Static spin structure factor of CuGeO3 above spin-Peierls transition temperature

✍ Scribed by I. Harada; Y. Aoyama

• Book ID: 104152017
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 95 KB
• Volume: 60
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00061-x

✦ Synopsis

We study, by means of the quantum transfer matrix method, the finite-temperature behavior of the S 1/2 antiferromagnetic chain with nearest neighbor and competing next nearest neighbor interactions, which is a model for the spin-Peierls material, CuGeO 3 . In particular, the static spin structure factor is found to display an interesting phenomenon as a consequence of the competition: a characteristic wave number for the maximum value of the structure factor takes a commensurate or an incommensurate value, depending on temperature. The boundary, called a Lifshitz temperature, can be found in this material. We discuss such behavior in connection with the experimental result of the neutron scattering in CuGeO 3 above the spin-Peierls transition temperature.