Research/Sitter/MAGNDATA / 1.191_HoCr(BO3)2.mcif

HoCr(BO₃)₂

MAGNDATA entry 1.191 · 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 ¹3̄ × ²1: 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_S 1 BNS 2.7
Point group	11′
Parent space group	R 3 No. 148
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 3/2] 1k
Cell	a 4.7641 · b 4.7641 · c 31.0342 Å · α 90° · β 90° · γ 120°
Transition	8 K (−265 °C)
Measured at	1.5 K
Magnetic ions	Cr
Largest moment component	2.44 μ_B
Method	A similar structure is reported in the same reference for the analogous compound YCr(BO3)2 (see #1.190)

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_S 1 →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ho1	Ho	0	0	0
Cr1	Cr	0	0	0.25	2.44	2.44	1.87	3.0742
B1	B	0	0	0.379
O1_1	O	0.3046	0.0301	0.3779
O1_2	O	0.9699	0.2745	0.3779
O1_3	O	0.7255	0.6954	0.3779

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

R. Sinclair et al. PHYSICAL REVIEW B (2017) · doi:10.1103/PhysRevB.95.174410

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.191_HoCr(BO3)2.mcif from MAGNDATA · entry page

sha256 of this copy: fd4dc0d3e37c2eefba7d75345dd0579992da1c51aaca70af345972c9dcc2d12b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.191_HoCr(BO3)2.mcif.