Altermagnets Database

Identity

Elements

Ba, Co, Sb, O

Space group i Parent crystallographic space-group.

${\mathrm{Cmcm}}$ (63), ${\mathrm{P}6_{3}/\mathrm{mmc}}$ (194)

MAGNDATA IDs i A screened entry may correspond to one or more entries in the MAGNDATA database.

• 1.0.44

ICSD IDs

151442

Parent space group(s) i Parent nonmagnetic space group(s) reported by the MAGNDATA-based symmetry analysis after Spglib standardisation.

${\mathrm{Cmcm}}$ (63), ${\mathrm{P}6_{3}/\mathrm{mmc}}$ (194)

References

• 10.1088/0953-8984/16/49/009

Properties

KS Gap i The band gap from Kohn-Sham DFT.

2.439 eV

KS Gap Type

Semiconducting

Min abundance i Minimum crustal abundance among the constituent elements, reported in ppm as a simple scarcity proxy.

0.200 ppm

Spin-splitting metrics

$\Delta E^{\mathrm{max}}_{\mathrm{split}}$ i Largest spin splitting within ±3 eV of the Fermi level in the high-throughput calculation.

0.044 eV

$\Delta E^{\mathrm{avg}}_{\mathrm{split}}$ i Brillouin-zone average of the largest spin splitting at each k-point within the same energy window.

0.038 eV

FΔ i Fraction of the sampled Brillouin zone and near-Fermi bands with appreciable spin splitting.

24.8%

Symmetry screening

The summary table shows one row per linked MAGNDATA record and symmetry-precision variant. If a MAGNDATA ID has multiple Spglib symprec values in the source data, it appears on multiple rows. The cards below keep the same expanded per-variant detail view, including wave classification and mismatch metrics.

MAGNDATA ID	Collinearity i Whether the magnetic configuration was collinear in MAGNDATA or constructed from a noncollinear entry.	Phase i Some materials also have non-altermagnetic (AM) phases predicted; AM for altermagnet and FiM for ferrimagnet.	Wave i Symmetry wave-class shorthand derived from the parent and halving-subgroup Laue classes used in the altermagnetism analysis.	SYMPREC i Spglib symmetry tolerance symprec, shown as an exponential base-10 value.	BNS (MCIF) i BNS setting indicated in the source MCIF file.	G	H
1.0.44	Based on noncollinear	AM	d	$10^{-5}$	${\mathrm{Cm}^{\prime}\mathrm{c}2_{1}^{\prime}}$ (36.174)	mmm	2/m
1.0.44	Based on noncollinear	AM	g	$10^{-2}$	${\mathrm{Cm}^{\prime}\mathrm{c}2_{1}^{\prime}}$ (36.174)	6/mmm	-3m

MAGNDATA 1.0.44

$\mathrm{Ba_{3}CoSb_{2}O_{9}}$

Open entry

Collinearity Based on noncollinear

Phase AM

Wave d

BNS (MCIF) i BNS setting indicated in the source MCIF file.

${\mathrm{Cm}^{\prime}\mathrm{c}2_{1}^{\prime}}$ (36.174)

BNS

${\mathrm{Cmc}^{\prime}\mathrm{m}^{\prime}}$ (63.463)

Parent SG

${\mathrm{Cmcm}}$ (63)

SYMPREC i Spglib symmetry tolerance symprec, shown as an exponential base-10 value.

$10^{-5}$

Connecting element

$C_{21}$

G Laue class

mmm

H Laue class

2/m

Spin-angle mismatch

60.0°

Reference links

• 10.1088/0953-8984/16/49/009

MAGNDATA 1.0.44

$\mathrm{Ba_{3}CoSb_{2}O_{9}}$

Open entry

Collinearity Based on noncollinear

Phase AM

Wave g

BNS (MCIF) i BNS setting indicated in the source MCIF file.

${\mathrm{Cm}^{\prime}\mathrm{c}2_{1}^{\prime}}$ (36.174)

BNS

${\mathrm{P}6_{3}^{\prime}/\mathrm{m}^{\prime}\mathrm{c}^{\prime}\mathrm{m}}$ (193.258)

Parent SG

${\mathrm{P}6_{3}/\mathrm{mmc}}$ (194)

SYMPREC i Spglib symmetry tolerance symprec, shown as an exponential base-10 value.

$10^{-2}$

Connecting element

$C_{2z}$

G Laue class

6/mmm

H Laue class

-3m

Spin-angle mismatch

60.0°

Reference links

• 10.1088/0953-8984/16/49/009