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Persistent URL
http://purl.org/net/epubs/work/10689529
Record Status
Checked
Record Id
10689529
Title
Melting of chiral order in terbium manganate (TbMnO
3
) observed with resonant x-ray Bragg diffraction
Contributors
SW Lovesey (STFC Rutherford Appleton Lab.)
,
V Scagnoli
,
M Garganourakis
,
SM Koohpayeh
,
C Detlefs
,
U Staub
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
Keywords
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Language
English (EN)
Type
Details
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Year
Journal Article
J Phys-Condens Mat
25, no. 36 (2013): 362202.
doi:10.1088/0953-8984/25/36/362202
2013
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