Raman scattering under extreme conditions*

Project supported by the Ministry of Science and Technology of China (Grant Nos. 2016YFA0300504 and 2017YFA0302904) and the National Natural Science Foundation of China (Grant Nos. 11474357, 11774419, 11604383, and 11704401). Y. Y. was supported by the Scientific Equipment Development Project of Chinese Academy of Sciences (Grant No. YJKYYQ20170027).
Jin Feng1, Yang Yang2, Zhang An-Min1, Ji Jian-Ting1, 2, Zhang Qing-Ming1, 2, 3, †
       

(color online) (a) Magneto-Raman spectra of Co[N(CN)2]2 at T = 5.5 K under magnetic fields up to 34 T. The strong field-dependent feature, assigned as a Co2+ electronic excitation, is marked with an asterisk. (b) Raman shift versus applied fields, showing the hybridized electronic and phonon excitations in Co[N(CN)2]2. The red curves are fitting results using the theory of Ref. [36]. The inset shows a schematic energy level diagram for Co2+ electronic states. The red (solid) arrow shows a plausible candidate for the 114 ± 5 cm−1 excitation in Raman spectra. (c) Temperature dependence of magneto-Raman spectra at 18.6 ± 0.1 T. Black (dashed) lines are peak fits tracking the behavior of Co2+ electronic excitations, which displays no sensitivity to Curie temperature ∼ 9 K. Reprinted with permission from Ref. [34], copyright 2013 by the American Physical Society.