Observation of Unusual Magnetoelastic Effects in a Quasi-1D Spiral Magnet

Abstract

We present a systematic study of spin and lattice dynamics in the quasi-one-dimensional spiral magnet CuBr2, using Raman scattering in conjunction with infrared and neutron spectroscopy. Along with the development of spin correlations upon cooling, we observe a rich set of broad Raman bands at energies that correspond to phonon-dispersion energies near the one-dimensional magnetic wave vector. The low-energy bands further exhibit a distinct intensity maximum at the spiral magnetic ordering temperature. We attribute these unusual observations to two possible underlying mechanisms: (1) formation of hybrid spin-lattice excitations, and/or (2) "quadrumerization" of the lattice caused by spin-singlet entanglement in competition with the spiral magnetism.

arXiv comment4 pages, 4 figures; SM available upon request

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• Dzyaloshinskii-Moriya interaction and magnetic skyrmions induced by curvature
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• Growth and characterization of HgBa2CaCu2O6+d and HgBa2Ca2Cu3O8+d crystals
• Giant pressure-enhancement of multiferroicity in CuBr2
• NMR Evidence of Charge Fluctuations in Multiferroic CuBr2
• Exploration of magnetoelastic deformations in spin-chain compound CuBr${}_2$
• Inelastic Neutron Scattering for Direct Detection of Chiral Phonons