Role of Antisymmetric Exchange in Selecting Magnetic Chirality in Ba$_3$NbFe$_3$Si$_2$O$_{14}$

Authors :: Zorko, A.
Pregelj, M.
Potočnik, A.
van Tol, J.
Ozarowski, A.
Simonet, V.
Lejay, P.
Petit, S.
Ballou, R.
Source :: Phys. Rev. Lett. 107, 257203 (2011)
Publication Year :: 2011
Abstract: We present electron spin resonance (ESR) investigation of the acentric \FeLang, 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 $d_c=45$ mK is responsible for selecting a unique ground state, which endures thermal fluctuations up to astonishingly high temperatures.<br />Comment: 4+ pages, 4 figures, 3+ pages of supplementary information with 2 additional figures, accepted for publication in PRL

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