2007/04/30 by Jung Hoon Kim, Jung Hoon Han · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Coupling (piping) #Dispersion (optics) #Dispersion relation #Ferromagnetism #Instability #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetization #Magnon #Materials science #Multiferroics and related materials #Phonon #Physics #Quantum mechanics #Roton #Spin (aerodynamics) #Spin wave #Superfluidity #Wave vector #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.054431
published as Physical Review B 76, 054431 (2007) · 6 pages, 5 figures; references added, minor text revisions, submitted to PRB
arxiv created 2007/07/02 · openalex publication_date 2007/08/17 · arxiv updated 2011/11/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the influence of the spin-phonon coupling in the triangular antiferromagnet where the coupling is of the exchange-striction type. The magnon dispersion is shown to be modified significantly at wave vector (2\ensuremathπ,0) and its symmetry-related points, exhibiting a rotonlike minimum and an eventual instability in the dispersion. Various correlation functions such as equal-time phonon correlation, spin-spin correlation, and local magnetization are calculated in the presence of the coupling.