title: Role of antisymmetric exchange in selecting magnetic chirality in Ba3NbFe3Si2O14.
abstract: We present an electron spin resonance (ESR) investigation of the acentric Ba(3)NbFe(3)Si(2)O(14), featuring a unique single-domain double-chiral magnetic ground state. Combining simulations of the ESR linewidth anisotropy and the antiferromagnetic-resonance modes allows us to single out the Dzyaloshinsky-Moriya (DM) interaction as the leading magnetic anisotropy term. We demonstrate that the rather minute out-of-plane DM component d(c)=45 mK is responsible for selecting a unique ground state, which endures thermal fluctuations up to astonishingly high temperatures.
authors.affiliation: Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
authors.forename: A
authors.initials: A
authors.lastname: Zorko
authors.forename: M
authors.initials: M
authors.lastname: Pregelj
authors.forename: A
authors.initials: A
authors.lastname: Potočnik
authors.forename: J
authors.initials: J
authors.lastname: van Tol
authors.forename: A
authors.initials: A
authors.lastname: Ozarowski
authors.forename: V
authors.initials: V
authors.lastname: Simonet
authors.forename: P
authors.initials: P
authors.lastname: Lejay
authors.forename: S
authors.initials: S
authors.lastname: Petit
authors.forename: R
authors.initials: R
authors.lastname: Ballou