Research/Sitter/MAGNDATA / 0.428_BaMn2Si2O7.mcif

BaMn₂Si₂O₇

MAGNDATA entry 0.428 · source

s-wave compensated ferrimagnet

Opposite moments cancel, but the two sublattices aren't related by any symmetry, so the bands split like a ferromagnet's (s-wave).

Spin group ¹2/¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 26 K (−247 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2/c BNS 15.85
Parent space group	C 2/c No. 15
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.2761 · b 12.9361 · c 14.0012 Å · α 90° · β 90.21° · γ 90°
Transition	26 K (−247 °C)
Measured at	4 K
Magnetic ions	Mn
Largest moment component	3.9 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 C 2/c →

Atom sites · 13 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ba1	Ba	0.2049	0.4717	0.126
Mn1	Mn	0	0.7374	0.25	0	3.9	0	3.9
Mn2	Mn	0	0.263	0.25	0	3.9	0	3.9
Mn3	Mn	0.0313	0.266	0.5194	0	−3.9	0	3.9
Si1	Si	0.2292	0.1269	0.1301
Si2	Si	0.3227	0.4047	0.3821
O1	O	0.0877	0.2217	0.1105
O2	O	0.1886	0.3892	0.2971
O3	O	0.234	0.131	0.5127
O4	O	0.4908	0.3244	0.1381
O5	O	0.0965	0.0203	0.125
O6	O	0.2767	0.148	0.2449
O7	O	0.3818	0.1088	0.0478

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

J. Ma et al. PHYSICAL REVIEW B (2013) · doi:10.1103/PhysRevB.88.144405

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.428_BaMn2Si2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 48874a3b2a6c4a2ceefc35ab9b8b6e3a5035b97194e9d61919ae03f36d2b3634
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.428_BaMn2Si2O7.mcif.