G-type antiferromagnetic BiFeO3 is classified as a bulk g-wave altermagnet with spin splitting up to about 0.2 eV, using a completed group-theory table for (d,g,i)-wave altermagnets.
We further classify it as bulk since the character of the Γ + 2 irrep is −1 for the two-fold axes in the kz=0 plane
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G-type Antiferromagnetic BiFeO$_3$ is a Multiferroic $g$-wave Altermagnet
G-type antiferromagnetic BiFeO3 is classified as a bulk g-wave altermagnet with spin splitting up to about 0.2 eV, using a completed group-theory table for (d,g,i)-wave altermagnets.