Altermagnets Database

Identity

Elements

Na, Mn, H, C, O

Space group i Parent crystallographic space-group.

${\mathrm{Pbca}}$ (61)

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

• 0.955

ICSD IDs

n/a

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

${\mathrm{Pbca}}$ (61)

References

n/a

Properties

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

3.726 eV

KS Gap Type

Semiconducting

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

200.0 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.

0.073 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.

0.053 eV

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

15.5%

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
0.955	Collinear	AM	d	$10^{-5}$	${\mathrm{Pbca}}$ (61.433)	mmm	2/m

MAGNDATA 0.955

$\mathrm{Na_{2}Mn(H_{2}C_{3}O_{4})_{2} (H_{2}O)_{2}}$

Open entry

Collinearity Collinear

Phase AM

Wave d

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

${\mathrm{Pbca}}$ (61.433)

BNS

${\mathrm{Pb}^{\prime}\mathrm{c}^{\prime}\mathrm{a}}$ (61.436)

Parent SG

${\mathrm{Pbca}}$ (61)

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

0.0°

Reference links

n/a

Notes and warnings

• Spglib mcif symmetry mismatch