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

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.

Language

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English

Journal

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Physical Review Research (Internet)

Volume

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8

Number

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1

Pages

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p.013344_1 - 013344_11

Publication Year/Month

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2026/03

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Held date

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Paper URL

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https://doi.org/10.1103/rw5c-491w

DOI for research data

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Link to research data related to this paper/report.

Keywords

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Random singlet physics; pyrochlore; S=1/2 Heisenberg antiferromagnet

Research Facility

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第4研究棟  

Press Release

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JAEA R&D Navigator

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Cooperating Institute

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Charles University

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- Accesses

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