title: Longitudinal spin density wave order in a quasi-1D Ising-like quantum antiferromagnet.
abstract: From neutron diffraction measurements on a quasi-1D Ising-like Co2+ spin compound BaCo2V2O8, we observed an appearance of a novel type of incommensurate ordering in magnetic fields. This ordering is essentially different from the Néel-type ordering, which is expected for the classical system, and the peculiar spin structure is caused by quantum fluctuation inherent in the quantum spin chain. A Tomonaga-Luttinger liquid nature characteristic of the gapless quantum 1D system is responsible for the realization of the incommensurate ordering.
authors.affiliation: KYOKUGEN, Osaka University, Machikaneyama 1-3, Toyanaka 560-8531, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Matsuda
authors.forename: T
authors.initials: T
authors.lastname: Masuda
authors.forename: S
authors.initials: S
authors.lastname: Hondo
authors.forename: K
authors.initials: K
authors.lastname: Kaneko
authors.forename: N
authors.initials: N
authors.lastname: Metoki
authors.forename: M
authors.initials: M
authors.lastname: Hagiwara
authors.forename: T
authors.initials: T
authors.lastname: Takeuchi
authors.forename: K
authors.initials: K
authors.lastname: Okunishi
authors.forename: Z
authors.initials: Z
authors.lastname: He
authors.forename: K
authors.initials: K
authors.lastname: Kindo
authors.forename: T
authors.initials: T
authors.lastname: Taniyama
authors.forename: M
authors.initials: M
authors.lastname: Itoh