1.
Phys Rev Lett
; 106(19): 197204, 2011 May 13.
Article
in English
| MEDLINE
| ID: mdl-21668197
ABSTRACT
Using powder neutron diffraction, we have discovered an unusual magnetic order-order transition in the Ising spin chain compound Ca3Co2O6. On lowering the temperature, an antiferromagnetic phase with a propagation vector k=(0.5,-0.5,1) emerges from a higher temperature spin density wave structure with k=(0,0,1.01). This transition occurs over an unprecedented time scale of several hours and is never complete.