The space group corepresentations of antiferromagnetic NiO

Abstract

The geometry of the Brillouin zone of antiferromagnetic NiO (C c 2/c) is studied. The corepresentations of the magnetic little group are deduced for the points and lines of symmetry. The magnon symmetries are investigated and the selection rules for two magnon electric dipole and magnetic dipole absorption are deduced. 494 A. P. CBACKNELL AND S. J. JOSHUA in the direction of the intersection of the sheet with the vertical plane through the z-axis and [110]. We shall then classify the eigenstates of the crystal both above and below T N by finding the irreducible corepresentations of the group of the wave vector for each of the points and hnes of symmetry of the Brillouin zone of the appropriate magnetic space group of NiO (7).

Structural Distortion Stabilizing the Antiferromagnetic and Semiconducting Ground State of BaMn2As2

“…The antiferromagnetic structure of NiO is invariant under the symmetry operations of the type IV Shubnikov space group C c 2/c [2] which may be written as [8]…”

“…when the magnetic structure is orientated as given in Fig.1 (and in Ref. [2]). As in our former papers, we write the symmetry operations {R|t} in the Seitz notation: R is a point group operation and t the subsequent translation.…”

“…Notes to Table A5 (i) The space group Cc is the unitary subgroup of the magnetic group M 9 = Cc + K{C 2b |0}Cc leaving invariant both the experimentally observed [2,[28][29][30][31] antiferromagnetic structure and the dislocations of the Ni atoms shown in Fig. 1 (a).…”

“…Above T N , NiO possesses the fcc structure Fm3m = Γ f c O 5 h bearing the international number 225 [1]. Cracknell and Joshua [2] found that, below T N , the magnetic structure is invariant under the magnetic group C c 2/c which will be given explicitly in Eq. (1).…”

Ultrafast Modification of HubbardUin a Strongly Correlated Material:Ab initioHigh-Harmonic Generation in NiO

“…All the calculations presented here were performed for bulk NiO, which is a type-II antiferromagnetic material below its his Néel temperature (T N = 523K [58]) [59]. The driving field is taken along the [001] crystallographic direction in all the calculations.…”