Research/Sitter/MAGNDATA / 0.151_Tm2Mn2O7.mcif

Tm₂Mn₂O₇

MAGNDATA entry 0.151 · source

noncoplanar ferrimagnet

Opposite moments of different size leave a net magnetisation.

ordered ≤ 25 K (−248 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I 4₁/a m′ d′ BNS 141.557
Point group	4/mm′m′
Parent space group	F d 3m No. 227
Spins	noncoplanar · net moment 31.76 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 6.96471 · b 6.96471 · c 9.84959 Å · α 90° · β 90° · γ 90°
Transition	25 K (−248 °C)
Measured at	5 K
Magnetic ions	Mn, Tm
Largest moment component	2.31 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 I 4₁/a m′ d′ →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Mn_1	Mn	0	0	0	0	0.81	1.66	1.8471
Tm_1	Tm	0	0	0.5	0	−0.05	2.31	2.3105
O1_1	O	0	0.25	0.375
O2_1	O	0	0.25	0.0794
O2_2	O	0.2044	0.4544	0.875

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

E. Pomjakushina et al. Inorg.Chem. (2015) · doi:10.1021/acs.inorgchem.5b01498

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.151_Tm2Mn2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 685f7b2ce2dc7c29ebdb6fc870696211b2fa9d69dcbe113fd3f4b74661ecc7c3
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.151_Tm2Mn2O7.mcif.