Abstract
The magnetic structures of hexagonal manganitesYMnO3 and LuMnO3 have been studied by powder neutron diffraction up to 6 GPa in the temperature range10–295 K. At ambient pressure, a triangular antiferromagnetic (AFM) state of aΓ1 irreducible representationis stable below TN = 70 K in YMnO3. Uponthe application of high pressure, a spin reorientation is induced and the triangular AFM structure evolvesfrom Γ1 to Γ1+Γ2 representations. On the other hand, inLuMnO3 the triangular AFMstate of a Γ2 irreduciblerepresentation with TN≈90 K remains stable over the entire pressure range investigated. Theordered magnetic moment values decrease under pressure withdM/dP = −0.35 μB GPa−1 inYMnO3 and −0.08 μB GPa−1 in LuMnO3. Simultaneously, a considerable increase in diffuse scattering intensity was found inYMnO3, while it was muchless pronounced for LuMnO3. Both features indicate the enhancement of spin fluctuations due to geometricalfrustration effects and an increase in the volume fraction of the spin-liquid statecoexisting with the ordered AFM phase. The characteristic spin correlation lengthis weakly affected by pressure. The relationship between the pressure-inducedbehaviour of magnetic structure and the structural characteristics of thequasi-two-dimensional (2D) triangular network formed by Mn and O ions in hexagonalRMnO3 is analysed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
