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Persistent URL http://purl.org/net/epubs/work/10689529
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Record Id 10689529
Title Melting of chiral order in terbium manganate (TbMnO3) observed with resonant x-ray Bragg diffraction
Abstract Resonant Bragg diffraction of soft, circularly polarized x-rays has been used to observe directly the temperature dependence of chiral-order melting in a motif of Mn ions in terbium manganate. The underlying mechanism uses the b-axis component of a cycloid, which vanishes outside the polar phase. Melting is witnessed by the first and second harmonics of a cycloid, and we explain why the observed temperature dependence differs in the two harmonics. Conclusions follow from an exact treatment of diffraction by using atomic multipoles in a circular cycloid, since a standard treatment of the diffraction, based on a single material-vector identified with the magnetic dipole, does not reproduce correctly observations at the second harmonic.
Organisation ISIS , STFC
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Journal Article J Phys-Condens Mat 25, no. 36 (2013): 362202. doi:10.1088/0953-8984/25/36/362202 2013