2018/09/20 by Yasuhito Matsubayashi, Daigorou Hirai, Masashi Tokunaga +1
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Crystal (programming language) #Crystal twinning #Macle #Magnetic domain #Magnetic susceptibility #Multiferroics and related materials #Nuclear materials and radiation effects #Oxide #Phase (matter) #Pyrochlore #Tetragonal crystal system #cond-mat.supr-con
paper · pdf · doi:10.7566/jpsj.87.104604
published as J. Phys. Soc. Jpn., 87, 104604 (2018) · 8 pages, 7 figures, J. Phys. Soc. Jpn, in press
arxiv created 2018/09/20 · openalex created_date 2018/09/27 · openalex publication_date 2018/09/28 · arxiv updated 2018/10/02 · openalex updated_date 2026/08/05
The successive phase transitions of the pyrochlore oxide Cd2Re2O7 are studied by polarizing microscopy and magnetic susceptibility measurements. The formation of twin domains is visualized in the polarizing images of a pristine (111) crystal surface upon cooling through the cubic-to-tetragonal transition at Ts1 ~ 200 K. Moreover, a dramatic change in the twinning pattern is observed at Ts2 ~120 K, which suggests that the tetragonal c axis flips as the strain changes its direction at the tetragonal-to-tetragonal transition. Magnetic susceptibility measurements reveal significant domain alignment upon cooling across Ts1 and Ts2 in a magnetic field of 7 T, which are due to ~10% anisotropy in the magnetic susceptibility for the low-temperature phases. Interestingly, the anisotropy is reversed at Ts2: \chic < \chia above Ts2 and vice versa below Ts2.