Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 9: Correlated Magnetism – Low-Dimensional Systems
TT 9.6: Talk
Monday, March 17, 2025, 16:15–16:30, H33
Evidence of spin-phonon charge coupling in the quasi-1D Ising spin chain system α-CoV2O6 — •Debismita Naik and Pradip Khatua — Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal 741246, India
The quasi-one-dimensional Ising spin chain system α-CoV2O6 exhibits fascinating magnetic properties at lower temperatures. The DC magnetization and specific heat confirm the antiferromagnetic long-range ordering temperature TN = 15 K. From the specific heat, the calculated magnetic entropy above TN suggests short-range ordering in this low-dimensional compound. The temperature-dependent XRD supports the key finding of magnetoelastic coupling, which is crucial for linking the electrical and magnetic dipoles. Temperature-dependent Raman spectroscopy reveals the presence of spin-phonon coupling below TN. Additionally, the study highlights an unusual evolution of the Raman modes above TN which appears to be linked to short-range magnetic ordering. The renormalization of Raman modes and lattice anomalies near TN illustrate spin-lattice coupling via magnetoelastic and spin-phonon interactions leads to interplay between spin, charge, and phonon degrees of freedom in α-CoV2O6. To support the intriguing phenomena, the theoretical charge density difference maps suggest the formation of electrical dipoles between Co and O atoms below TN arises from p-d hybridization.
Keywords: Antiferromagnetism; Magneto-elastic; Spin-phonon coupling; Spin-orbit coupling; Magneto-dielectric effect