Abstract
Hysteresis phenomena are investigated around the temperature-induced neutral-ionic (N-I) phase transition in the prototype compound tetrathiafulvalene-p chloranil (TFF-CA). A multistep transition is evidenced by neutron scattering, with plateau evolution of Bragg peaks characteristic of symmetry breaking, as well as by specific heat measurements revealing a multipeak structure, both in perfect agreement. A structural study reveals the coexistence of N and I phases at a mesoscopic scale during the thermal hysteresis. No gradual process with intermediate long periodicity structure based on alternating N and I planes, as theoretically suggested, takes place. These results, supported by optical microscopy studies performed on both TTF-CA and tetramethylbenzidine-tetracyanoquinodimethane (TMB-TCNQ) crystals, underline the importance of interstack elastic coupling at the temperature-induced neutral-ionic transition.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
