日本語フィールド
著者：Meng, Dong-Dong; Zheng, Xu-Guang; Liu, Xiaodong; Xu, Xingliang; Guo, Qixin題名：Deuterium ordering found in new ferroelectric compound Co2(OD)3Cl発表情報：Materials Research Express 巻: 2 ページ: 076101キーワード：概要：抄録：A detailed temperature-dependent Raman spectroscopic study revealed a new type of deuterium-order ferroelectrics in a geometrically frustrated magnet Co2(OD)3Cl at Tε
= 229 K. Significant changes in the parameters of the Raman vibration modes were
observed near Tε, suggesting a strong phonon-charge coupling. Additional asymmetric
phonon bands appeared below around Tε, which are consistently interpreted by
phonon folding processes due to a small local structural change resulting from the
ordering of deuterium. The wavenumber and intensity changes of the Raman-active
modes, as well as the normalized intensities of the additional bands, all follow a
power-law fit Δω, ΔI, I ∝ (1－T / TC)2β, wherein TC = 230 K ~ Tε and β = 0.35(2),
clearly demonstrating an ordering process below Tε. The critical exponent is
reminiscent of a second order transition. Our study presents a rare and new type of
multiferroic material with ferroelectricity arising from the deuterium ordering in geometrically frustrated magnets.英語フィールド
Author：Meng, Dong-Dong; Zheng, Xu-Guang; Liu, Xiaodong; Xu, Xingliang; Guo, QixinTitle：Deuterium ordering found in new ferroelectric compound Co2(OD)3ClAnnouncement information:Materials Research Express Vol: 2 Page: 076101An abstract：A detailed temperature-dependent Raman spectroscopic study revealed a new type of deuterium-order ferroelectrics in a geometrically frustrated magnet Co2(OD)3Cl at Tε
= 229 K. Significant changes in the parameters of the Raman vibration modes were
observed near Tε, suggesting a strong phonon-charge coupling. Additional asymmetric
phonon bands appeared below around Tε, which are consistently interpreted by
phonon folding processes due to a small local structural change resulting from the
ordering of deuterium. The wavenumber and intensity changes of the Raman-active
modes, as well as the normalized intensities of the additional bands, all follow a
power-law fit Δω, ΔI, I ∝ (1－T / TC)2β, wherein TC = 230 K ~ Tε and β = 0.35(2),
clearly demonstrating an ordering process below Tε. The critical exponent is
reminiscent of a second order transition. Our study presents a rare and new type of
multiferroic material with ferroelectricity arising from the deuterium ordering in geometrically frustrated magnets.