Research/Sitter/MAGNDATA / 0.955_Na2Mn(H2C3O4)2(H2O)2.mcif

Na₂Mn₁C₆O₁₀H₈

MAGNDATA entry 0.955 · source

d-wave altermagnet

No net magnetisation, yet the electron bands are spin-split: the up and down spin sublattices are related only by a rotation or mirror, never by a shift or inversion. d-wave: the splitting changes sign twice around the Fermi surface (2 nodal planes).

Spin group ²m²m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 8 K (−265 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P b c a BNS 61.433
Point group	mmm
Parent space group	P b c a No. 61
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 6.8318 · b 9.518 · c 16.5191 Å · α 90° · β 90° · γ 90°
Transition	8 K (−265 °C)
Measured at	1.5 K
Magnetic ions	Mn
Largest moment component	4.42 μ_B
Method	NPD

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in P b c a →

Atom sites · 14 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn1	Mn	0	0	0.5	0	0	4.42	4.42
O1	O	0.1194	0.5738	0.8896
O2	O	0.0626	0.7018	0.0547
O3	O	0.2923	0.496	0.2029
O4	O	0.2028	0.7616	0.3005
O5	O	0.716	0.5917	0.9556
C1	C	0.1376	0.7987	0.3677
C2	C	0.0709	0.8192	0.9246
H1	H	0.384	0.445	0.1712
H2	H	0.264	0.4243	0.2413
C3	C	0.1213	0.8069	0.0126
Na1	Na	0.9983	0.6235	0.2042
H3	H	0.131	0.8973	0.9022
H4	H	0.5639	0.311	0.9145

Moment components are along the crystal axes a, b, c (μ_B), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

G. Rousse et al. Dalton Trans. (2016)

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.955_Na2Mn(H2C3O4)2(H2O)2.mcif from MAGNDATA · entry page

sha256 of this copy: 95878a48c1e5ac91edd019c9185207f501ac907d687b91475f63eaee6869b5fc
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.955_Na2Mn(H2C3O4)2(H2O)2.mcif.

Na2Mn1C6O10H8

Symmetry

Source

Original file

Na₂Mn₁C₆O₁₀H₈