Table 1 Basis vectors (BV) of each irrep present in the magnetic representation of the Ho 2c site for the space group \(P6_3/mmc.1'\) with \(\vec {k}_\mathrm{{HM}}=(0\,0\,\delta )\).

From: Revisiting the magnetic structure of Holmium at high pressure by using neutron diffraction

irrep

BV

Ho1 (1/3 2/3 1/4)

Ho2 (2/3 1/3 3/4)

m\(\Delta _2\)

\(\psi _1^2\)

\(\left( 0 \,0\, 1\right)\)

\(\left( 0 \,0 \,1\right) \text{e}^{-i\pi \delta }\)

m\(\Delta _3\)

\(\psi _1^3\)

\(\left( 0 \,0\, 1\right)\)

\(\left( 0 \,0 \,\bar{1}\right) \text{e}^{-i\pi \delta }\)

m\(\Delta _5\)

\(\psi _1^5\)

\(\left( 1-\frac{1}{\sqrt{3}}\,i,\,-\frac{2}{\sqrt{3}}\,i,\,0\right)\)

\(\left( 1-\frac{1}{\sqrt{3}}\,i,\,-\frac{2}{\sqrt{3}}\,i,\,0\right) \text{e}^{-i\pi (\delta +1)}\)

\(\psi _2^5\)

\(\left( -\frac{2}{\sqrt{3}}\,i,\,1-\frac{1}{\sqrt{3}}\,i,\,0\right)\)

\(\left( -\frac{2}{\sqrt{3}}\,i,\,1-\frac{1}{\sqrt{3}}\,i,\,0\right) \text{e}^{-i\pi (\delta +1)}\)

m\(\Delta _6\)

\(\psi _1^6\)

\(\left( 1-\frac{1}{\sqrt{3}}\,i,\,-\frac{2}{\sqrt{3}}\,i,\,0\right)\)

\(\left( 1-\frac{1}{\sqrt{3}}\,i,\,-\frac{2}{\sqrt{3}}\,i,\,0\right) \text{e}^{-i\pi \delta }\)

\(\psi _2^6\)

\(\left( -\frac{2}{\sqrt{3}}\,i,\,1-\frac{1}{\sqrt{3}}\,i,\,0\right)\)

\(\left( -\frac{2}{\sqrt{3}}\,i,\,1-\frac{1}{\sqrt{3}}\,i,\,0\right) \text{e}^{-i\pi \delta }\)

  1. The basis vectors components are expressed in terms of the crystallographic axis a, b and c.