SpinW¶
Spin Hamiltonian¶
\[\mathcal{H}
=
\mu_B H
\sum_i
g_i \mathbf{S}_i
+
\sum_i
\mathbf{S}_i A_i \mathbf{S}_i
+
\sum_{i \neq j}
\mathbf{S}_i J_{ij} \mathbf{S}_j
+
\sum_{i \neq j}
B (\mathbf{S}_i \cdot \mathbf{S}_j)^2\]
where first term is a Zeeman interaction, second is a single-ion anisotropy, third is a bilinear interaction and fourth is a biquadratic interaction.
Convention¶
Spin normalized |
no |
Multiple counting |
no |