Crystal and Magnetic Structure
| Formula | FeF3 |
|---|---|
| Cell | \(a\)\({} = 10.3250\,\mathring{\mathrm{A}}\)\(\alpha\)\({} = 90.00^\circ\)\(b\)\({} = 10.3250\,\mathring{\mathrm{A}}\)\(\beta\)\({} = 90.00^\circ\)\(c\)\({} = 10.3250\,\mathring{\mathrm{A}}\)\(\gamma\)\({} = 90.00^\circ\) |
| Sites | 64 in the cell, 16 magnetic |
| Crystal SG | \(Fd\bar{3}m:2\) (#227) |
| MSG Family SG | \(Fd\bar{3}m\) (#227) |
| MSG (BNS) | \(Fd\bar{3}m'\) (#227.131) |
| Reference | Rev. Chim. Minér. 23, 474 (1986) |
Spin-Space Symmetry
| Crystal SG (\(G_0\)) | \(Fd\bar{3}m\) (#227) |
|---|---|
| \(\vec{Q}\) in \(G_0\) | \(\{\vec{0}\}\) |
| Parent SG (\(G\)) | \(Fd\bar{3}m\) (#227) |
| Point Group (\(P\)) | \(O_{h}\) (\(m\bar{3}m\))\(m\bar{3}m\) (\(O_{h}\)) |
| Regular | Yes, \([G_0 : G] = 1\) |
| \(\dim\Gamma\) | 3, non-coplanar |
| \(\Lambda^1\Gamma = \Gamma\) | \(T_{2g}\), \(\{\vec{0}\}\) |
| \(\Lambda^2\Gamma = \Gamma\otimes\det\Gamma\) | \(T_{1g}\), \(\{\vec{0}\}\) |
| \(\Lambda^3\Gamma = \det\Gamma\) | \(A_{2g}\), \(\{\vec{0}\}\) |
Stars of the wavevectors \(\vec{k}\) of each irreducible part, in order, in the setting of \(G\). (Spin space group 227.2.1.2)
Magnetic Symmetry
| Crystal SG (\(G_0\)) | \(Fd\bar{3}m\) (#227) |
|---|---|
| \(\vec{Q}\) in \(G_0\) | \(\{\vec{0}\}\) |
| Parent SG (\(G\)) | \(Fd\bar{3}m\) (#227) |
| Point Group (\(P\)) | \(O_{h}\) (\(m\bar{3}m\))\(m\bar{3}m\) (\(O_{h}\)) |
| Regular | Yes, \([G_0 : G] = 1\) |
| \(\Phi\) | \(A_{2g}\), \(\{\vec{0}\}\) |
| \(\Lambda^1\Gamma = \Phi\otimes\Gamma_1^+\) | \(T_{2g}\), \(\{\vec{0}\}\) |
| \(\Lambda^2\Gamma = \Gamma_1^+\) | \(T_{1g}\), \(\{\vec{0}\}\) |
| \(\Lambda^3\Gamma = \Phi\) | \(A_{2g}\), \(\{\vec{0}\}\) |
Stars of the wavevectors \(\vec{k}\) of each irreducible part, in order, in the setting of \(G\).
Non-Relativistic Responses
| Response | Symbol | Required Overlap | Allowed |
|---|---|---|---|
| Net Spin Magnetization | \(\vec{M}\) | \(\Gamma\cap\Gamma_0^+\) | ✗ |
| Piezomagnetism | \(\vec{C}_{\mu\nu}\) | \(\Gamma\cap\Gamma_2^+\) | ✓ |
| Time-Odd Spin Conductivity | \(\Sigma^{-}\) | \(\Gamma\cap(\Gamma_0^+\oplus\Gamma_1^+\oplus\Gamma_2^+)\) | ✓ |
| Time-Even Spin Conductivity | \(\Sigma^{+}\) | \(\Lambda^2\Gamma\cap(\Gamma_0^+\oplus\Gamma_1^+\oplus\Gamma_2^+)\) | ✓ |
| Anomalous Hall Conductivity | \(\sigma^{-}\) | \(\Lambda^3\Gamma\cap\Gamma_1^+\) | ✗ |
| Time-Odd Edelstein Effect | \(\alpha^{-}\) | \(\Gamma\cap\Gamma_1^-\) | ✗ |
| Time-Even Edelstein Effect | \(\alpha^{+}\) | \(\Lambda^2\Gamma\cap\Gamma_1^-\) | ✗ |
| Spin Texture, Even Rank | \(\vec{s}(\vec{q})\) | \(\Gamma\cap\Gamma_\ell^+\) | d-wave \((\ell=2)\)a |
| Spin Texture, Odd Rank | \(\vec{s}(\vec{q})\) | \(\Lambda^2\Gamma\cap\Gamma_\ell^-\) | ✗a |
\(\vec{M}\) = net spin magnetization, \(\vec{C}_{\mu\nu}\) = piezomagnetism, \(\Sigma^{-}\) = time-odd spin conductivity, \(\Sigma^{+}\) = time-even spin conductivity, \(\sigma^{-}\) = anomalous Hall conductivity, \(\alpha^{-}\) = time-odd Edelstein effect, \(\alpha^{+}\) = time-even Edelstein effect, \(\vec{s}(\vec{q})\) = spin texture
Relativistic Responses
| Response | Symbol | Required Overlap | Allowed |
|---|---|---|---|
| Net Spin Magnetization | \(\vec{M}\) | \(\Gamma\cap\Gamma_0^+\) | ✗ |
| Piezomagnetism | \(\vec{C}_{\mu\nu}\) | \(\Gamma\cap\Gamma_2^+\) | ✓ |
| Time-Odd Spin Conductivity | \(\Sigma^{-}\) | \(\Gamma\cap(\Gamma_0^+\oplus\Gamma_1^+\oplus\Gamma_2^+)\) | ✓ |
| Time-Even Spin Conductivity | \(\Sigma^{+}\) | \(\Lambda^2\Gamma\cap(\Gamma_0^+\oplus\Gamma_1^+\oplus\Gamma_2^+)\) | ✓ |
| Anomalous Hall Conductivity | \(\sigma^{-}\) | \(\Lambda^3\Gamma\cap\Gamma_1^+\) | ✗ |
| Time-Odd Edelstein Effect | \(\alpha^{-}\) | \(\Gamma\cap\Gamma_1^-\) | ✗ |
| Time-Even Edelstein Effect | \(\alpha^{+}\) | \(\Lambda^2\Gamma\cap\Gamma_1^-\) | ✗ |
| Spin Texture, Even Rank | \(\vec{s}(\vec{q})\) | \(\Gamma\cap\Gamma_\ell^+\) | d-wave \((\ell=2)\)a |
| Spin Texture, Odd Rank | \(\vec{s}(\vec{q})\) | \(\Lambda^2\Gamma\cap\Gamma_\ell^-\) | ✗a |
\(\vec{M}\) = net spin magnetization, \(\vec{C}_{\mu\nu}\) = piezomagnetism, \(\Sigma^{-}\) = time-odd spin conductivity, \(\Sigma^{+}\) = time-even spin conductivity, \(\sigma^{-}\) = anomalous Hall conductivity, \(\alpha^{-}\) = time-odd Edelstein effect, \(\alpha^{+}\) = time-even Edelstein effect, \(\vec{s}(\vec{q})\) = spin texture
Multipoles, \(\boldsymbol{P = O_{h}\ (m\bar{3}m)}\)\(\boldsymbol{P = m\bar{3}m\ (O_{h})}\)
| Multipole | Multipole | Decomposition | |
|---|---|---|---|
| Scalar | \(\Gamma_0^+\) | \(A_{1g}\) | |
| Polar Vector | \(\Gamma_1^-\) | \(T_{1u}\) | |
| Axial Vector | \(\Gamma_1^+\) | \(T_{1g}\) | |
| Quadrupole | \(\Gamma_2^+\) | \(E_{g}\) \(\oplus\) \(T_{2g}\) | |
| Multipole | Multipole | Decomposition | |
|---|---|---|---|
| Octupole | \(\Gamma_3^-\) | \(A_{2u}\) \(\oplus\) \(T_{1u}\) \(\oplus\) \(T_{2u}\) | |
| Hexadecapole | \(\Gamma_4^+\) | \(A_{1g}\) \(\oplus\) \(E_{g}\) \(\oplus\) \(T_{1g}\) \(\oplus\) \(T_{2g}\) | |
| Dotriacontapole | \(\Gamma_5^-\) | \(E_{u}\) \(\oplus\) \(2T_{1u}\) \(\oplus\) \(T_{2u}\) | |
| Hexacontatetrapole | \(\Gamma_6^+\) | \(A_{1g}\) \(\oplus\) \(A_{2g}\) \(\oplus\) \(E_{g}\) \(\oplus\) \(T_{1g}\) \(\oplus\) \(2T_{2g}\) | |
\(\Gamma_0^+\) = scalar, \(\Gamma_1^-\) = polar vector, \(\Gamma_1^+\) = axial vector, \(\Gamma_2^+\) = quadrupole, \(\Gamma_3^-\) = octupole, \(\Gamma_4^+\) = hexadecapole, \(\Gamma_5^-\) = dotriacontapole, \(\Gamma_6^+\) = hexacontatetrapole
Representation
Each box is one operation \(\ssop{\mat{\Gamma}(g)}{g}\): \(\ssop{U}{g}\)\(\{\mat{\Gamma}(g)\,\Vert\,g\}\): \(\{U\,\Vert\,g\}\), the space-group operation \(g\) with its spin rotation \(U\) named, above the matrix \(\mat{\Gamma}(g)\) in the spin basis \(\vhat{N}_i\) below or, with the toggle, the three-dimensional representative \(\mat{U}\) in Cartesian spin coordinates.
Spin Frame
Symmetry-adapted basis of the spin subspace (Cartesian components): \(\vhat{N}_1 = (1,\, 0,\, 0)\), \(\vhat{N}_2 = (0,\, 1,\, 0)\), \(\vhat{N}_3 = (0,\, 0,\, 1)\). In this basis translations act diagonally wherever their wavevectors are time-reversal invariant.
Lattice Translations and Centerings
Point Operations
One coset representative \(g=[\mat{R}\,|\,\vec{t}]\)\(g=\{\mat{R}\,|\,\vec{t}\}\) per element of \(P\), in the conventional setting of \(G\). Operations marked generate \(P\).
Multipoles, \(\boldsymbol{P = O_{h}\ (m\bar{3}m)}\)\(\boldsymbol{P = m\bar{3}m\ (O_{h})}\)
| Multipole | Multipole | Decomposition | |
|---|---|---|---|
| Scalar | \(\Gamma_0^+\) | \(A_{1g}\) | |
| Polar Vector | \(\Gamma_1^-\) | \(T_{1u}\) | |
| Axial Vector | \(\Gamma_1^+\) | \(T_{1g}\) | |
| Quadrupole | \(\Gamma_2^+\) | \(E_{g}\) \(\oplus\) \(T_{2g}\) | |
| Multipole | Multipole | Decomposition | |
|---|---|---|---|
| Octupole | \(\Gamma_3^-\) | \(A_{2u}\) \(\oplus\) \(T_{1u}\) \(\oplus\) \(T_{2u}\) | |
| Hexadecapole | \(\Gamma_4^+\) | \(A_{1g}\) \(\oplus\) \(E_{g}\) \(\oplus\) \(T_{1g}\) \(\oplus\) \(T_{2g}\) | |
| Dotriacontapole | \(\Gamma_5^-\) | \(E_{u}\) \(\oplus\) \(2T_{1u}\) \(\oplus\) \(T_{2u}\) | |
| Hexacontatetrapole | \(\Gamma_6^+\) | \(A_{1g}\) \(\oplus\) \(A_{2g}\) \(\oplus\) \(E_{g}\) \(\oplus\) \(T_{1g}\) \(\oplus\) \(2T_{2g}\) | |
\(\Gamma_0^+\) = scalar, \(\Gamma_1^-\) = polar vector, \(\Gamma_1^+\) = axial vector, \(\Gamma_2^+\) = quadrupole, \(\Gamma_3^-\) = octupole, \(\Gamma_4^+\) = hexadecapole, \(\Gamma_5^-\) = dotriacontapole, \(\Gamma_6^+\) = hexacontatetrapole
Representation
Each box is one operation \(\ssop{\mat{\Gamma}(g)}{g}\): \(\ssop{U}{g}\)\(\{\mat{\Gamma}(g)\,\Vert\,g\}\): \(\{U\,\Vert\,g\}\), the space-group operation \(g\) with its spin rotation \(U\) named, above the matrix \(\mat{\Gamma}(g)\) in the spin basis \(\vhat{N}_i\) below or, with the toggle, the three-dimensional representative \(\mat{U}\) in Cartesian spin coordinates.
Spin Frame
Symmetry-adapted basis of the spin subspace (Cartesian components): \(\vhat{N}_1 = (1,\, 0,\, 0)\), \(\vhat{N}_2 = (0,\, 1,\, 0)\), \(\vhat{N}_3 = (0,\, 0,\, 1)\). In this basis translations act diagonally wherever their wavevectors are time-reversal invariant.
Lattice Translations and Centerings
Point Operations
One coset representative \(g=[\mat{R}\,|\,\vec{t}]\)\(g=\{\mat{R}\,|\,\vec{t}\}\) per element of \(P\), in the conventional setting of \(G\). Operations marked generate \(P\).
Sites
Crystal Sites
One row per site of the crystal: its Wyckoff position and site symmetry in \(G_0\).
| Site | Wyckoff | Site Symmetry | Fractional |
|---|---|---|---|
| Fe1 | 16d | \(D_{3d}\) (\(.\bar{3}m\))\(.\bar{3}m\) (\(D_{3d}\)) | 0.0000,0.0000,0.0000 |
| F1 | 48f | \(C_{2v}\) (\(2.mm\))\(2.mm\) (\(C_{2v}\)) | 0.0604,0.3750,0.3750 |
Magnetic Sites
Every magnetic site in the cell, with its moment in Cartesian coordinates.
| Site | Fractional | m [μB] | |m| [μB] | Allowed |
|---|---|---|---|---|
| Fe1 | 0.0000,0.0000,0.0000 | +1.917,+1.917,+1.917 | 3.320 | (mx, mx, mx) |
| Fe2 | 0.5000,0.7500,0.2500 | +1.917,−1.917,−1.917 | 3.320 | (mx, −mx, −mx) |
| Fe3 | 0.7500,0.2500,0.5000 | −1.917,−1.917,+1.917 | 3.320 | (−mx, −mx, mx) |
| Fe4 | 0.2500,0.5000,0.7500 | −1.917,+1.917,−1.917 | 3.320 | (−mx, mx, −mx) |
| Fe5 | 0.0000,0.7500,0.7500 | +1.917,−1.917,−1.917 | 3.320 | (mx, −mx, −mx) |
| Fe6 | 0.5000,0.0000,0.5000 | +1.917,+1.917,+1.917 | 3.320 | (mx, mx, mx) |
| Fe7 | 0.7500,0.5000,0.2500 | −1.917,+1.917,−1.917 | 3.320 | (−mx, mx, −mx) |
| Fe8 | 0.2500,0.2500,0.0000 | −1.917,−1.917,+1.917 | 3.320 | (−mx, −mx, mx) |
| Fe9 | 0.5000,0.5000,0.0000 | +1.917,+1.917,+1.917 | 3.320 | (mx, mx, mx) |
| Fe10 | 0.7500,0.0000,0.7500 | −1.917,+1.917,−1.917 | 3.320 | (−mx, mx, −mx) |
| Fe11 | 0.0000,0.2500,0.2500 | +1.917,−1.917,−1.917 | 3.320 | (mx, −mx, −mx) |
| Fe12 | 0.2500,0.7500,0.5000 | −1.917,−1.917,+1.917 | 3.320 | (−mx, −mx, mx) |
| Fe13 | 0.5000,0.2500,0.7500 | +1.917,−1.917,−1.917 | 3.320 | (mx, −mx, −mx) |
| Fe14 | 0.7500,0.7500,0.0000 | −1.917,−1.917,+1.917 | 3.320 | (−mx, −mx, mx) |
| Fe15 | 0.2500,0.0000,0.2500 | −1.917,+1.917,−1.917 | 3.320 | (−mx, mx, −mx) |
| Fe16 | 0.0000,0.5000,0.5000 | +1.917,+1.917,+1.917 | 3.320 | (mx, mx, mx) |
| Net | +0.000,+0.000,+0.000 | 0.000 |
Verification
| 48 operations from spinspg map the structure onto itself | positions \(5.6\times10^{-15}\) Å, moments \(1.9\times10^{-15}\) |
| Spin operations preserve the moment subspace \(V\) | \(0\) |
| Spin-only partners agree on \(V\) (\(\Gamma\) well defined) | \(0\) |
| \(\Gamma\) orthogonal / homomorphism | \(6.7\times10^{-16}\) / \(1.1\times10^{-15}\) |
| Cross-check with FindSpinGroup: same \(G_0, G\), order | ✓ |
| same parent group as Cartesian operations | ✓ |
| same representatives \(U\) | \(\max|\Delta U| = 1.0\times10^{-15}\) |
| same content of \(\Gamma\) and same responses | ✓ |
| FindSpinGroup SSG label (reference only) | 227.2.1.2 |
| Tolerances | positions 0.01 Å, moments 0.01 \(\mu_\mathrm{B}\) |
Independent Checks
| FindSpinGroup, without spin–orbit coupling | ✓ 14 agree |
| Neumann's principle, non-relativistic | ✓ 10 agree |
| FindSpinGroup, with spin–orbit coupling | ✓ 15 agree |
| Neumann's principle, relativistic | ✓ 10 agree |
| Magnetic space group: spglib, FindSpinGroup and the MCIF | ✓ 9 agree |
| Point group and \(\Phi\): FindSpinGroup | ✓ 5 agree |
| The paper's rules for magnetic space groups | ✓ 2 agree |
Notes
Notation follows Spin Space Symmetry Without Spin Space Groups. The spin space group is encoded by the parent space
group \(G\) and the real representation \(\Gamma\) of \(G\) on the
span \(V\) of the moments, \(\mat{\Gamma}(g)=\trp{\mat{Q}}\mat{S}\mat{Q}\) for each spin-space operation
\(\ssop{\mat{S}}{g}\); its three-dimensional representatives are \(\mat{U}=\mat{\Gamma}(g)\mat{1}\) (collinear),
\(\operatorname{diag}(\mat{\Gamma}(g),\det\mat{\Gamma}(g))\) (coplanar) and \(\mat{\Gamma}(g)\) (non-coplanar).
A response is allowed when the \(\vec{k}=\vec{0}\) part of the indicated exterior power overlaps the indicated
point-group representation (\(\Gamma_\ell^\pm\): rank-\(\ell\) multipole of parity ±).
Mulliken labels follow the Bilbao conventions (\(C_2'\) along the conventional \(a\) axes,
\(\sigma_v\) containing them).
Parts at finite \(\vec{k}\) carry Miller–Love labels (ISO-IR tables) in the standard setting of \(G\) nearest the MCIF's standard setting of \(G_0\) (origin at \((0, 0, 0)\) in it). Wavevectors are in the
conventional reciprocal basis of the group named, in its standard setting (\(G\) for
\(\Gamma\) and its exterior powers, \(G_0\) for the propagation vector
\(\vec{Q}\)): components \(\vec{k}=(k_1,k_2,k_3)\) along the reciprocal vectors
\(\vec{b}_j\) of its conventional cell \(\vec{a}_i\), with
\(\vec{a}_i\cdot\vec{b}_j=\delta_{ij}\), so a translation \(\vec{t}=\sum_i t_i\vec{a}_i\)
carries the phase \(e^{2\pi i\,\vec{k}\cdot\vec{t}}\). Each is reduced to its shortest representative modulo
that group's reciprocal lattice, with CDML labels where tabulated. Operations use Seitz notation in the
standard setting chosen by spglib.
Source: file 04_FeF3_pyrochlore_AIAO.mcif.