title: Coexistence of long-range order and spin fluctuation in geometrically frustrated clinoatacamite Cu2Cl(OH)3.
abstract: Muon spin rotation experiments are carried out on clinoatacamite, Cu2Cl(OH)3, which is a new geometrically frustrated system featuring a three-dimensional network of corner-sharing tetrahedral 3d Cu2+ spins. A long-range antiferromagnetic order occurs below 18.1 K with a surprisingly small entropy release of about 0.05Rln2/Cu. Below 6.5 K, the static long-range order transforms abruptly into a metastable state with nearly complete depolarization of muon spins which suggests strong fluctuation. The system then enters a state in which partial long-range order and spin fluctuation coexist down to the lowest experimentally attainable temperature of 20 mK. This work presents a novel system for studying geometric frustration.
authors.affiliation: Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan. zheng@cc.saga-u.ac.jp
authors.forename: X G
authors.initials: XG
authors.lastname: Zheng
authors.forename: H
authors.initials: H
authors.lastname: Kubozono
authors.forename: K
authors.initials: K
authors.lastname: Nishiyama
authors.forename: W
authors.initials: W
authors.lastname: Higemoto
authors.forename: T
authors.initials: T
authors.lastname: Kawae
authors.forename: A
authors.initials: A
authors.lastname: Koda
authors.forename: C N
authors.initials: CN
authors.lastname: Xu