SAIP2013

Magnetic Symmetry for Hexagonal Manganite RMO3

9 Jul 2013, 17:40

1h

Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster1

Speakers

Dr Augusto Machatine (University of Pretoria) Mr Prime Niyongabo (University of Pretoria)

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Abstract content <br> &nbsp; (Max 300 words)

We study the symmetry of hexagonal manganite RMO3 ( R = Sc, Y, Ho, Er, Tm) at room temperature with non-magnetic space group P63mc and below the transition temperature TN = 7 0 …130 K with magnetic space groups ( P6'3cm, P6'3c'm, P6'3 ) for parallel and (P63c'm', P63cm, P63) for anti-parallel orientation in planar -triangular structures. We calculate and tabulate the irreducible representations and the co-representations of non-magnetic and magnetic space groups respectively at high symmetry points and lines throughout the fundamental domain in the Brillouin zone. These irreducible representations and co-representations are the starting point in calculations of the coupling coefficients. They are also needed for structure elucidation in X-ray, electron and neutron diffraction experiments. The coupling coefficients are used in the calculation of material tensors, like Raman scattering tensors, Brillouin scattering, morphic effects in crystals, as well as non-linear magneto-optical properties. The selection rules and wave vector selection rules for these space groups are given.