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下野 聖矢*; 石橋 広記*; 永吉 祐輔*; 池野 豪一*; 河口 彰吾*; 萩原 雅人; 鳥居 周輝*; 神山 崇*; 市橋 克哉*; 西原 禎文*; et al.
Journal of Physics and Chemistry of Solids, 163, p.110568_1 - 110568_7, 2022/04
被引用回数:2 パーセンタイル:8.12(Chemistry, Multidisciplinary)The structural phase transition from cubic () to a
tetragonal (
) at
180 K was found in non-centrosymmetric oxyfluoride Co
Sb
O
F
by high-resolution neutron and synchrotron powder diffraction. To investigate this phase transition, specific heat, magnetization, and dielectric measurements were performed. Although the specific heat and dielectric constant showed anomalies at
, a phase transition to ferroelectricity was not observed in the polarization hysteresis loop down to 30 K. The rotation of the CoO
F
octahedron was observed at
from the structural analysis using synchrotron and neutron powder diffraction data. It was found that the magnetic phase transition from paramagnetic to G-type antiferromagnetic occurred at
67 K, at which a peak was observed in the specific heat measurements, via magnetic structure analysis using neutron powder diffraction data. The magnetic moments of Co
were aligned along the tetragonal
-axis direction with a Co
moment of 2.80(1)
at 13 K.
北條 元*; 藤田 晃司*; 池野 豪一*; 的場 智彦*; 溝口 照康*; 田中 功*; 中村 哲也*; 竹田 幸治; 岡根 哲夫; 田中 勝久*
Applied Physics Letters, 104(11), p.112408_1 - 112408_5, 2014/03
被引用回数:8 パーセンタイル:33.21(Physics, Applied)The solid solutions between ilmenite and hematite have recently attracted considerable attention as a spintronic material due to their interesting magnetic and electrical properties. In this study, the electronic and magnetic structures of epitaxially grown ilmenite-hematite solid solution thin films were investigated by combining X-ray absorption near-edge structure (XANES), X-ray magnetic circular dichroism (XMCD) for two different crystallographic projections, and first-principles theoretical calculations.