Research/Sitter/MAGNDATA / 0.49_Ho2Ru2O7.mcif

Ho₂Ru₂O₇

MAGNDATA entry 0.49 · source

noncoplanar ferrimagnet

Opposite moments of different size leave a net magnetisation.

ordered ≤ 95 K (−178 °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 14.4 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 10.1417 · b 10.1417 · c 10.1417 Å · α 90° · β 90° · γ 90°
Transition	95 K (−178 °C)
Measured at	20 K
Magnetic ions	Ho, Ru
Largest moment component	0.9 μ_B
Method	Pyrochlore

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)
O1_1	O	0.339	0.125	0.125
O1_2	O	0.125	0.125	0.339
O2	O	0.375	0.375	0.375
Ho1	Ho	0.5	0.5	0.5
Ru1	Ru	0	0	0	0.56	0.56	0.9	1.1988

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

C. Wiebe et al. PHYSICAL REVIEW LETTERS (2004) · doi:10.1103/physrevlett.93.076403

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.49_Ho2Ru2O7.mcif from MAGNDATA · entry page

sha256 of this copy: 9cd241e6558fccaa7182922a4566b94c177ddf2a327f3616cade374e4d9f6d7b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.49_Ho2Ru2O7.mcif.