Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 25, Issue 36, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/25/36/362202
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Funding
- Swiss National Science Foundation
- DoE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [Award DE-FG02-08ER46544]
- NCCR MaNEP
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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.
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