Role of Antisymmetric Exchange in Selecting Magnetic Chirality in Ba3NbFe3Si2O14
Abstract
We present electron spin resonance (ESR) investigation of the acentric , featuring a unique single-domain double-chiral magnetic ground state. Combining simulations of the ESR line-width 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 dc=45 mK is responsible for selecting a unique ground state, which endures thermal fluctuations up to astonishingly high temperatures.
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