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Quantum magnetisms in uniform triangular lattices Li2AMo3O8 (A = In, Sc) | K. Iida
; H. Yoshida
; H. Okabe
; N. Katayama
; Y. Ishii
; A. Koda
; Y. Inamura
; N. Murai
; M. Ishikado
; R. Kadono
; R. Kajimoto
; | Date: |
18 Feb 2019 | Abstract: | Molecular based spin-1/2 triangular lattice systems such as
LiZn$_2$Mo$_3$O$_8$ have attracted research interest. Distortions, defects, and
intersite disorder are suppressed in such molecular-based magnets, and
intrinsic geometrical frustration gives rise to unconventional and unexpected
ground states. Li$_2$$A$Mo$_3$O$_8$ ($A$ = In or Sc) is such a compound where
spin-1/2 Mo$_3$O$_{13}$ clusters in place of Mo ions form the uniform
triangular lattice. Their ground states are different according to the $A$
site. Li$_2$InMo$_3$O$_8$ undergoes conventional $120^circ$ long-range
magnetic order below $T_ ext{N}=12$~K whereas isomorphic Li$_2$ScMo$_3$O$_8$
exhibits no long-range magnetic order down to 0.5~K. Here, we report exotic
magnetisms in Li$_2$InMo$_3$O$_8$ and Li$_2$ScMo$_3$O$_8$ investigated by muon
spin rotation ($mu$SR) and inelastic neutron scattering (INS) spectroscopies
using polycrystalline samples. Li$_2$InMo$_3$O$_8$ and Li$_2$ScMo$_3$O$_8$ show
completely different behaviors observed in both $mu$SR and INS measurements,
representing their different ground states. Li$_2$InMo$_3$O$_8$ exhibits spin
wave excitation which is quantitatively described by the nearest neighbor
anisotropic Heisenberg model based on the $120^circ$ spin structure. In
contrast, Li$_2$ScMo$_3$O$_8$ undergoes short-range magnetic order below 4~K
with quantum-spin-liquid-like magnetic fluctuations down to the base
temperature. Origin of the different ground states is discussed in terms of
anisotropies of crystal structures and magnetic interactions. | Source: | arXiv, 1902.6407 | Services: | Forum | Review | PDF | Favorites |
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