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.
EP V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany.
M V
MV
Eremin
D V
DV
Zakharov
H-A Krug
HA
von Nidda
R M
RM
Eremina
A
A
Shuvaev
A
A
Pimenov
P
P
Ghigna
J
J
Deisenhofer
A
A
Loidl