Research/Sitter/MAGNDATA / 1.218_Tm2BaNiO5.mcif

Tm₂BaNiO₅

MAGNDATA entry 1.218 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹2/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 15 K (−258 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_S1 BNS 2.7
Parent space group	I m m m No. 71
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 0 1/2] 1k
Cell	a 7.5025 · b 5.7214 · c 22.4912 Å · α 90° · β 90° · γ 90°
Transition	15 K (−258 °C)
Measured at	1.5 K
Magnetic ions	Ni, Tm
Largest moment component	3.24 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_S1 →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tm1	Tm	0.25	0	0.1017	−0.6	3.24	−0.5	3.3328
Ba1	Ba	0.25	0.5	0
Ni1	Ni	0	0	0	0.3	−1.1	0.14	1.1487
O1_1	O	0	0.2399	0.075
O1_2	O	0	0.7601	0.075
O2	O	0	0.5	0.25

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. Garcia-Matres et al. Eur. Phys. J. B (2001) · doi:10.1007/s100510170022

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.218_Tm2BaNiO5.mcif from MAGNDATA · entry page

sha256 of this copy: 5259475c769a80dcdacbb8f987d8184767a64a0f55846c040279ba009286b9cb
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.218_Tm2BaNiO5.mcif.