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Classical Spin Liquid State in the S=frac{5}{2} Heisenberg Kagom\'e Antiferromagnet Li₉Fe₃(P₂O₇)₃(PO₄)₂
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Classical Spin Liquid State in the S=frac{5}{2} Heisenberg Kagom\'e Antiferromagnet Li₉Fe₃(P₂O₇)₃(PO₄)₂
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We investigate the low temperature magnetic properties of a $S=\frac{5}{2}$ Heisenberg kagom\'e antiferromagnet, the layered monodiphosphate Li$_9$Fe$_3$(P$_2$O$_7$)$_3$(PO$_4$)$_2$, using magnetization measurements and $^{31}$P nuclear magnetic resonance. An antiferromagnetic-type order sets in at $T_{\rm N}=1.3$ K and a characteristic magnetization plateau is observed at 1/3 of the saturation magnetization below $T^* \sim 5$ K. A moderate $^{31}$P NMR line broadening reveals the development of anisotropic short-range correlations within the plateau phase concomitantly with a gapless spin-lattice relaxation time $T_1 \sim k_B T / \hbar S$, which both point to the presence of a semiclassical nematic spin liquid state predicted for the Heisenberg kagom\'e antiferromagnetic model or to the persistence of the zero-energy modes of the kagome lattice under large magnetic fields.
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