Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 27: Frustrated Magnets I
MA 27.2: Talk
Wednesday, March 20, 2024, 15:15–15:30, H 2013
Raman scattering of spin-1/2 mixed dimensionalities antiferromagnet: α-Cu2V2O7 — •Arvind Kumar Yogi1, Hemant Singh Kunwar1, Isha Isha1, Binoy Krishna De1, Vivek Dwij2, Mayanak Kumar Gupta3, R. Mittal3, R. Venkatesh1, R. J. Chaudhary1, Mahesh Vedpathak4, and V. G. Sathe1 — 1UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore-452001, India — 2Department of Condensed Matter Physics and Material Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005,India — 3Solid State Physics Division, Bhabha Atomic Research Centre, Trombey, Mumbai-400005, India — 4Department of Physics, Vidya Pratishthan’s Arts, Science and Commerce, Baramati-413133, India
We present a detailed investigation of the lattice vibrations and magnetic properties of the spin-1/2 α-Cu2V2O7 system by means of x-ray diffraction (XRD), magnetic susceptibility, specific heat, x-ray absorption spectroscopy (XAS), x-ray photoelectron spectroscopy (XPS), and Raman scattering measurements along with a phonon structure calculations by density-functional theory (DFT). Thermodynamic measurements show a long-range ordered (LRO) state at Néel temperature TN∼ 33.4 K. The spin-lattice coupling constant of spin-1/2 α-Cu2V2O7 has been calculated for various phonon modes. Despite exchange coupling in 1D chains, the susceptibility, low-temperature heat-capacity and Raman spectroscopic analysis confirms the antiferromagnetic order emerges from the mixed dimensionality nature of the exchange couplings.
Keywords: Quantum Magnets; Antiferromagnetism; Magnetism; One-dimensional chains; Frustrated lattice