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Hydrogen/Deuterium Dynamics in Hydroxyl Salts Co2(OH)3Br/Co2(OD)3Br Revealed by Muon Spin Relaxation.


ABSTRACT: The temperature-dependent dynamics of the hydrogen/deuterium atoms in geometrically frustrated magnets Co2(OH)3Br and its deuterated form Co2(OD)3Br were investigated by muon spin relaxation (μSR). The deuterium atoms in Co2(OD)3Br were found to be rapidly fluctuating at high temperatures, which should be arising as a quantum atomic effect due to the small mass of deuterium, then they drastically slowed down toward Tc = 250 K where a broad anomaly appeared in the dielectric response, and finally became quasi-static at around 180 K. Meanwhile, the hydrogen atoms in Co2(OH)3Br also exhibited a two-step slowing at ~240 K and ~180 K, respectively. The revealed properties in Co2(OH)3Br/Co2(OD)3Br are reminiscent of relaxor-type ferroelectrics. The present study suggested the effectiveness of the μSR technique on revealing the hydrogen/deuterium (H/D) dynamics in Co2(OH)3Br/Co2(OD)3Br. Furthermore, magnetic coupling was found to be existing at high temperatures in this system. This work provides clear evidence to the mechanism of ferroelectric responses in the hydroxyl salts, i.e., the slowing of protons (deuterium ions) is directly related to the newly revealed ferroelectricity.

SUBMITTER: Xu XL 

PROVIDER: S-EPMC6651803 | biostudies-other | 2019 Jul

REPOSITORIES: biostudies-other

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Hydrogen/Deuterium Dynamics in Hydroxyl Salts Co<sub>2</sub>(OH)<sub>3</sub>Br/Co<sub>2</sub>(OD)<sub>3</sub>Br Revealed by Muon Spin Relaxation.

Xu Xing-Liang XL   Zheng Xu-Guang XG   Watanabe Isao I  

Materials (Basel, Switzerland) 20190703 13


The temperature-dependent dynamics of the hydrogen/deuterium atoms in geometrically frustrated magnets Co<sub>2</sub>(OH)<sub>3</sub>Br and its deuterated form Co<sub>2</sub>(OD)<sub>3</sub>Br were investigated by muon spin relaxation (<i>μ</i>SR). The deuterium atoms in Co<sub>2</sub>(OD)<sub>3</sub>Br were found to be rapidly fluctuating at high temperatures, which should be arising as a quantum atomic effect due to the small mass of deuterium, then they drastically slowed down toward <i>T<sub  ...[more]

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