Order by static disorder in the Ising chain magnet Ca3Co2-xMnxO6.
Ising chain compound Ca3Co2-xMnxO6 exhibits up-up-down-down long-range magnetic order (LRO) in a broad range of 0.75<x<1. The LRO is abruptly lost in the narrow vicinity of x=1, and the magnetic state becomes incommensurate. The commensurate state (but not the LRO) is recovered for larger x. This is surprising because the stoichiometric x=1 state exhibits the best Co/Mn ionic order, and the magnetic LRO appears only in the samples with reduced ionic order. We argue that this "order-by-static-disorder" phenomenon may be related to the disruption of the long-range magnetic interactions by the magnetic-site disorder, reducing magnetic frustration.
Kiryukhin
V
V
Department of Physics and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA.
Lee
Seongsu
S
Ratcliff
W
W
Huang
Q
Q
Yi
H T
HT
Choi
Y J
YJ
Cheong
S-W
SW