Research/Sitter/MAGNDATA / 0.390_Y2SrCu0.6Co1.4O6.5.mcif

Y₂SrCu_0.6Co_1.4O_6.5

MAGNDATA entry 0.390 · source

d-wave altermagnet

No net magnetisation, yet the electron bands are spin-split: the up and down spin sublattices are related only by a rotation or mirror, never by a shift or inversion. d-wave: the splitting changes sign twice around the Fermi surface (2 nodal planes).

Spin group ¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 385 K (112 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I b′ a′ m BNS 72.543
Parent space group	I b a m No. 72
Spins	collinear · 2 nodal planes · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.4234 · b 10.7175 · c 19.9449 Å · α 90° · β 90° · γ 90°
Transition	385 K (112 °C)
Measured at	2 K
Magnetic ions	Co
Largest moment component	2.18 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 b′ a′ m →

Atom sites · 10 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Y1	Y	0.2058	0.3619	0.1832
Sr1	Sr	0.1959	0.3635	0
Cu1	Cu	0.7116	0.384	0.0996
Co2	Co	0.7116	0.384	0.0996	0	2.18	0	2.18
O1	O	0.1874	0.1077	0
O2	O	0	0.5	0.1039
O3	O	0.5	0	0.25
O4	O	0	0.2225	0.25
O5	O	0.4773	0.252	0.1057
O6	O	0	0	0.355

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.K. Li et al. PHYSICAL REVIEW B (2000) · doi:10.1103/PhysRevB.62.14149

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.390_Y2SrCu0.6Co1.4O6.5.mcif from MAGNDATA · entry page

sha256 of this copy: af0adc8f0e81e4da60ac695311d6f8fbaa142a98f76241d9702a1f3aeb478c01
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.390_Y2SrCu0.6Co1.4O6.5.mcif.