J. Phys. Soc. Jpn. 86, 123709 (2017) [5 Pages]
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LETTERS

Two-phonon Absorption Spectra in the Layered Honeycomb Compound α-RuCl3

Yoshinao Hasegawa1,, Takuya Aoyama1, Koya Sasaki1, Yuka Ikemoto2, Taro Moriwaki2, Toshiya Shirakura1, Riichiro Saito1, Yoshinori Imai1, and Kenya Ohgushi1
+ Affiliations
1Department of Physics, Tohoku University, Sendai 980-8578, Japan2SPring-8/JASRI, Mikazuki, Hyogo 679-5098, Japan
Received August 24, 2017; Accepted November 1, 2017; Published November 29, 2017

We performed infrared absorption spectroscopy for α-RuCl3 with a two-dimensional honeycomb lattice of Ru3+ ions. In the mid-infrared range, we observed three absorption peaks corresponding to intra-atomic d–d transitions among Ru3+ ions in accordance with a previous report. In the far-infrared range, we observed conspicuous broad absorption structures near 600 cm−1 in addition to several sharp single phonon peaks. Our first-principles calculations for the isolate sandwich model together with the factor group analysis revealed that the peak structures near 600 cm−1 are absorptions related to a two-phonon process. Our results stimulate further study on the spin–lattice coupling in α-RuCl3 as well as the optical detection of Majorana excitations in Kitaev spin liquids.

©2017 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.86.123709

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