Abstract
Previous x‐ray diffraction studies of the low‐temperature phase of s‐triazine identified the order parameter with a shear strain of the unit cell and interpreted the data in terms of a weakly first‐order transition. Independent measurements of the nuclear quadrupole resonance spectrum showed that the 14N lines split in the low temperature phase; this splitting was taken to be proportional to the order parameter and its variation with temperature was described in terms of that associated with a second‐order phase change, with a fluctuation contribution in the region of the transition. The present work shows that the first order nature of the transition is a necessary consequence of the symmetry of the system and the temperature dependence of the NQR frequencies can be explained if they are expressed as a sum of a term proportional to the order parameter together with a relatively large quadratic term whose magnitude can be qualitatively understood by a consideration of the environment of the nitrogen atoms.
Sign-in/Register to access full text options 
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.
