High-pressure Raman study of the quantum magnet (C&lt;sub&gt;4&lt;/sub&gt;H&lt;sub&gt;12&lt;/sub&gt;N&lt;sub&gt;2&lt;/sub&gt;)Cu&lt;sub&gt;2&lt;/sub&gt;Cl&lt;sub&gt;6&lt;/sub&gt;

Bettler, S.; Simutis, G.; Perren, G.; Blosser, D.; Gvasaliya, S.; Zheludev, A.

doi:10.1103/PhysRevB.96.174431

High-pressure Raman study of the quantum magnet (C₄H₁₂N₂)Cu₂Cl₆

Bettler S, Simutis G, Perren G, Blosser D, Gvasaliya S & Zheludev A

Citation

Bettler, S., Simutis, G., Perren, G., Blosser, D., Gvasaliya, S., & Zheludev, A. (2017). High-pressure Raman study of the quantum magnet (C₄H₁₂N₂)Cu₂Cl₆. Physical Review B, 96(17), 174431 (6 pp.). https://doi.org/10.1103/PhysRevB.96.174431

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:3282

Magnetic and lattice excitations in the quantum antiferromagnet (C₄H₁₂N₂)Cu₂Cl₆ (PHCC) are studied across two pressure-induced phase transition at P_c = 4.3 kbar and P₁ = 13.4 kbar using Raman spectroscopy. It is confirmed that neither transition is a result of a structural transformation. Magnetic scattering is detected. It shows a pronounced pressure dependence and undergoes substantial changes at both transitions. The results are in clear contradiction with previous neutron studies, which detected only minor changes of the magnon spectrum at P₁. A number of phonons show anomalous frequency shifts at low temperatures. This effect is pressure dependent and for two of the observed phonons dramatically reverses sign at around P₁. The anomalous behavior is attributed to strong magnetoelastic coupling in PHCC.