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Abstracts
P4.36
Investigation of exotic spin phases in the one-dimensional spin-1/2
quantum magnet LiCuSbO4 by high-field NMR spectroscopy
M. Iakovleva
IFW Dresden, Dresden, Germany
We will report our recent results of high-field NMR studies of the quantum magnet
LiCuSbO4 (LCSO) that presents an excellent model system of a one-dimensional
spin-1/2 quantum magnet with frustrated exchange interactions. Such networks
are predicted to exhibit a plethora of novel ground states beyond classical ferro-
or anti-ferromagnetic phases. In LCSO the absence of a long-range magnetic order
down to sub-Kelvin temperatures is suggestive of the realization of a quantum
spin liquid state. Our NMR measurements in strong magnetic fields up to 16
Tesla reveal clear indications for the occurrence of a long-sought field-induced
nematic phase close to the saturation field.
P4.37
High-field magnetic resonance spectroscopy on kagome
Swedenborgites
YBaCo
3
MO
7
(M=Al, Fe)
M. Iakovleva (1, 2, 3), J. Zeisner (1, 2), S. Zimmermann (1, 2), A. Alfonsov (1),
E.Vavilova (3), H.-J. Grafe (1), M. Valldor (4), B. B uchner (1, 2) and V. Kataev
(1)
1)IFW Dresden, Dresden, Germany
2)TU Dresden, Dresden, Germany
3) Zavoisky Physical Technical Institute, Kazan, Russia
4) IMax-Planck-Institute for Chemical Physics of Solids, Dresden, Germany
We performed a combined experimental study of magnetic properties of the
Swedenborgite type single crystals of YBaCo
3
AlO
7
and YBaCo
3
FeO
7
with
high field ESR and high field NMR spectroscopy. In title compounds the
magnetic lattice can be described as a stacking of kagome layers, where
unconventional ground states such as a spin liquid state can be expected due to the
strong geometrical frustration. The experimental results show the occurrence of
short-range quasi static electron spin correlations at T* = 22 K for YBaCo
3
AlO
7
and T*= 50K for YBaCo
3
FeO
7
but not a long-range antiferromagnetic order. We
compare our results with AC and DC susceptibility measurements and discuss a
possible competition between a spin glass-like state due to intrinsic structural
disorder and a spin liquid state arising from strong magnetic frustration in this
materials.
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