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Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Materials Physics 2018
August 16-17, 2018
August 16-17, 2018 | London, UK
4
th
International Conference on
Condensed Matter and Materials Physics
Geometrically frustrated magnetism and quantum atomic properties in hydroxyl salts
X G Zheng
Saga University, Japan
H
ydroxyl salts exist in nature. The most familiar might be the hydroxyl chloride Cu
2
(OH)
3
Cl (atacamite), which forms
naturally on copper and bronze as a green patina and is widely recognized as imparting characteristics to the Statue of
Liberty. But only in recent years, their intriguing magnetism, with prominent geometric frustration, have been uncovered
by us. Geometrically frustrated magnets, in which localized magnetic moments on triangular, kagome or pyrochlore lattices
interact through competing exchange interactions, have been of intense recent interest due to the diversity in the exotic ground
states that they display and potential applications that they may bring out. The diverse experimental reports of unconventional
magnetic properties also provide challenge and testing ground for theoretical models. Till now, we have discovered that the
hydroxyl salts of the typeM
2
(OH)
3
Cl or M(OH)Cl, whereM is a magnetic ion of Cu
2+
, Ni
2+
, Co
2+
, Fe
2+
, or Mn
2+
, are geometrically
frustrated magnets resulting from their crystal structures as illustrated in figure I. Furthermore, in some of these compounds
we found the occurrence of ferroelectricity with multiferroic features. In this talk, I will review our experimental results on
hydroxyl salts, together with a brief introduction to a less-known experimental technique
μ
SR.
Figure 1:
Typical structure in hydroxyl salts Co
2
(OH)
3
Cl.
Recent Publications:
1. XGZheng et al. (2005) Coexistence of long-range order and spin fluctuation in geometrically frustrated clinoatacamite
Cu
2
Cl(OH)
3
. Physical Review Letters. 95(5):057201.
2. XGZheng et al. (2006) Coexisting ferromagnetic order and disorder in a uniformsystemof hydroxyhalide Co
2
(OH)
3
Cl.
Physical Review Letters. 97(24):247204.
3. X G Zheng et al. (2008) Giant negative thermal expansion in magnetic nanocrystals. Nature Nanotechnology. 3:724-
726.
4. Masayoshi Fujihala et al. (2014) Unconventional spin freezing in the highly two-dimensional spin-1/2 kagome
antiferromagnet, Cd
2
Cu
3
(OH)
6
(SO
4
)
2
4H
2
O: evidence of partial order and coexisting spin singlet state on a distorted
kagome lattice. Physical Review B. 89:100401.
5. Xing Liang Xu et al. (2017) Critical slowing of quantum atomic deuterium/hydrogen with features of multiferroicity
in the geometrically frustrated system Co
2
(OD)3Cl/Co
2
(OH)
3
Cl. Physical Review B. 95:024111.
Biography
X G Zheng is received his PhD in Electrical Engineering from School of Engineering, Kyushu University during 1991/03. He worked as Assistant Professor in
Department of Physics, Saga University during 1996 - 2005 and at present he is a Professor in Department of Physics, Saga University.
zheng@cc.saga-u.ac.jpX G Zheng, Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C2-017