Abstract
Recently an X-ray experiment reported a coexisting phase of purely-electronic 2 k F charge density wave (CDW) and the conventional 2 k F spin density wave (SDW) in (TMTSF) 2PF 6. In order to understand such coexistence, we have performed a mean-field calculation for a Hubbard-type model of a quarter-filled one-dimensional chain. It is found that the coexistence of 2 k F SDW and purely-electronic 2 k F CDW is realized due to the effect of next-nearest-neighbor Coulomb repulsion. Phase diagrams are obtained as a function of nearest-and next-nearest-neighbor Coulomb interaction energies. Competition between the two coexistent states with 2 k F CDW and with 4 k F CDW is revealed, which gives a first order transition. It turns out that the internal degrees of freedom inside a dimer (consisting of two TMTSF molecules) play an important role. Our result supports the X-ray result of a coexisting phase in (TMTSF) 2PF 6.
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.
