Magnetic field-induced one-magnon Raman scattering in the magnon Bose-Einstein condensation phase of TlCuCl${}_3$

Abstract

We report the observation of the $A_{\mathrm{g}}$-symmetric one-magnon Raman peak in the magnon Bose-Einstein condensation phase of TlCuCl${}_3$. Its Raman shift traces the one-magnon energy at the magnetic $\Gamma$ point, and its intensity is proportional to the squared transverse magnetization. The appearance of the one-magnon Raman scattering originates from the exchange magnon Raman process and reflects the change of the magnetic-state symmetry. Using the bond-operator representation, we theoretically clarify the Raman selection rules, being consistent with the experimental results.

arXiv comment6 pages, 4 figures

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• On Josephson effects in insulating spin systems
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• Magnetism of the antiferromagnetic spin-$\frac{3}{2}$ dimer compound CrVMoO${}_7$ having an antiferromagnetically ordered state