Dynamical Dzyaloshinsky-Moriya interaction in KCuF3.
The spin dynamics of the prototypical quasi-one-dimensional antiferromagnetic Heisenberg spin S=1/2 chain KCuF3 is investigated by electron spin resonance spectroscopy. Our analysis shows that the peculiarities of the spin dynamics require a new dynamical form of the antisymmetric anisotropic spin-spin interaction. This dynamical Dzyaloshinsky-Moriya interaction is related to strong oscillations of the bridging fluorine ions perpendicular to the crystallographic c axis. This new mechanism allows us to resolve consistently the controversies in observation of the magnetic and structural properties of this orbitally ordered perovskite compound.
Eremin
M V
MV
EP V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany.
Zakharov
D V
DV
von Nidda
H-A Krug
HA
Eremina
R M
RM
Shuvaev
A
A
Pimenov
A
A
Ghigna
P
P
Deisenhofer
J
J
Loidl
A
A