Raman scattering under extreme conditions<xref rid="cpb_27_7_077801_fn1" ref-type="fn">*</xref><fn id="cpb_27_7_077801_fn1"> <label>*</label><p>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).</p></fn>

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-Ting^{1, 2}, Zhang Qing-Ming^{1, 2, 3, †}

(color online) (a) Crystal structure of Mn₃O₄ in the low-field monoclinic phase (top), intermediate undistorted tetragonal phase (middle), and high-field monoclinic phases (bottom). (b) Temperature dependence of T_2g Mn–O stretch mode, showing a mode splitting due to the removal of mode degeneracy from tetragonal II to monoclinic I transition. The inset shows an expanded view from 10 to 300 K. (c) Magnetic field dependence of T_2g mode at T = 7 K, showing the field-induced phase changes for H ∥ [1-10]. Reprinted with permission from Ref. [17], copyright 2010 by the American Physical Society.