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MM: Fachverband Metall- und Materialphysik
MM 6: Phase Transformations
MM 6.4: Vortrag
Montag, 17. März 2025, 16:30–16:45, H10
Anomalous spin-lattice coupling in the quasi-one-dimensional spin-1 corrugated skew-chain antiferromagnet: Ni2V2O7 — •Arvind Kumar Yogi1, Hemant Singh Kunwar1, Koushik Chakraborty1, Aditi Agrawal1, Binoy Krishna De1, Pragati Sharma1, Shalini Mishra2, D. T. Adroja3, Mayanak Kumar Gupta4, R. Mittal4, R. Venkatesh1, and V. G. Sathe1 — 1UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore-452001, India — 2Department of Physics, Govt. Holkar Science College, Indore (M.P.) 452001, India — 3ISIS Neutron and Muon Facility, STFC, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom — 4Solid State Physics Division, Bhabha Atomic Research Centre, Trombey, Mumbai-400005, India
We report spin-lattice coupling through detailed structural, magnetic, and lattice-dynamics studies of the S = 1 quasi-one-dimension lattice Ni2V2O7 compound. Our susceptibility χ (T) and heat capacity measurements (CP/T) measurement conclusively show that the antiferromagnetic transition occurs at TN1 = ∼6.7 K and TN2 = ∼5.8 K. From detailed lattice dynamics, two Raman mode showed anomalous lattice softening below ∼100 K due to Ni dimerization as supported by ordering of the J1 exchange interaction. Importantly, the spin-lattice coupling has been established below ∼100 K and the spin-lattice coupling constant (λsp) for various Raman modes has been deduced which shows multiferroic behaviour below TN1. In addition, the detailed study of lattice dynamics by first principle calculation is presented.
Keywords: Quantum Materials; X-ray diffraction; Raman Scattering; Symmetry-breaking; Frustrated lattice