Freezing of a disorder induced quantum spin liquid

Abstract

$\mathrm{S}{\mathrm{r}}_2\mathrm{CuT}{\mathrm{e}}_{0.5}{\mathrm{W}}_{0.5}{\mathrm{O}}_6$ is a square-lattice magnet with super-exchange between S=1/2 $\mathrm{C}{\mathrm{u}}^{2+}$ spins mediated by randomly distributed Te and W ions. Here, using sub-K temperature and 20 $\mu$eV energy resolution neutron scattering experiments we show that this system transits from a gapless disorder-induced quantum spin liquid to a new quantum state below ${\mathrm{T}}_{\mathrm{f}}$ = 1.7(1) K, exhibiting a weak frozen moment of <S>/S ~ 0.1 and low energy dynamic susceptibility,${\chi }^{\prime \prime }(\hslash \omega )$ linear in energy which is surprising for such a weak freezing in this highly fluctuating quantum regime.

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Cited by in corpus (7)

• Valence bond glass state in the 4$d^1$ fcc antiferromagnet Ba${}_2$LuMoO${}_6$
• Randomness and Frustration in a S = 1/2 Square-Lattice Heisenberg Antiferromagnet
• Structure, spin correlations and magnetism of the $S=1/2$ square-lattice antiferromagnet Sr${}_2$CuTe${}_{1-x}$W${}_x$O${}_6$ ($0\le x\le 1$)
• Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet
• The nature of low-temperature spin-freezing in frustrated Kitaev magnets
• Random singlet physics in exchange disordered 2D triangular YbCu${}_{1.14}$Se${}_2$
• Doping dependence of the magnetic ground state in the frustrated magnets Ba${}_2$$M$Te${}_{1-x}$W${}_x$O${}_6$ ($M$ = Mn, Co)