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Random singlet physics in the $$S=frac{1}{2}$$ pyrochlore antiferromagnet NaCdCu$$_2$$F$$_7$$

Kancko, A.*; 酒井 宏典   ; 徳永 陽  ; Colman, R. H.*; 他6名*

Kancko, A.*; Sakai, Hironori; Tokunaga, Yo; Colman, R. H.*; 6 of others*

We report a random-singlet ground state in the $$S=frac{1}{2}$$ Heisenberg pyrochlore antiferromagnet NaCdCu$$_2$$F$$_7$$. Cation disorder of Na$$^+$$ and Cd$$^{2+}$$ ions on the pyrochlore $$A$$ site generates a broad distribution of Cu$$^{2+}$$-F$$^{-}$$-Cu$$^{2+}$$ exchange couplings, introducing intrinsic magnetic bond disorder. Despite strong antiferromagnetic interactions, no magnetic order or global spin freezing is observed in dc and ac susceptibility, specific-heat, or $$^{23}$$Na nuclear magnetic resonance measurements down to 120 mK, while muon spin relaxation experiments confirm persistent spin dynamics down to 58 mK.

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