4.6 Article

Observation of a random singlet state in a diluted Kitaev honeycomb material

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PHYSICAL REVIEW B
卷 102, 期 9, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.094407

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资金

  1. National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2020R1A2C1003817]
  2. Deutsche Forschungsgemeinschaft (DFG) [SFB 1143, 247310070]
  3. Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat [EXC 2147, 390858490]
  4. Emmy Noether program [JA 2306/4-1, 411750675]

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We report a Cl-35 nuclear magnetic resonance (NMR) study of the diluted Kitaev material alpha-Ru1-xIrxCl3 (x = 0.1 and 0.2) where nonmagnetic Ir-3(+) dopants substitute Ru3+ ions. Upon dilution, the Cl-35 spectra exhibit unusual large magnetic inhomogeneity, which sets in at temperatures below the Kitaev exchange energy scale. At the same time, the Cl-35 spin-lattice relaxation rate T-1(-1) as a function of dilution and magnetic field unravels a critical doping of x(c) approximate to 0.22, towards which both the field-induced spin gap and the zero-field magnetic ordering are simultaneously suppressed, while novel gapless low-energy spin excitations dominate the relaxation process. These NMR findings point to the stabilization of a random singlet phase in alpha-Ru1-xIrxCl3, arising from the interplay of dilution and exchange frustration in the quantum limit.

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