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Field-induced instability of the quantum-spin-liquid ground state in the J_(rm eff)=frac{1}{2} triangular-lattice compound NaYbO₂

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arxiv 1901.07760 v2 pith:MFC3FPFW submitted 2019-01-23 cond-mat.str-el cond-mat.mtrl-sci

Field-induced instability of the quantum-spin-liquid ground state in the J_(rm eff)=frac{1}{2} triangular-lattice compound NaYbO₂

classification cond-mat.str-el cond-mat.mtrl-sci
keywords magneticorderabovebulkdownfield-inducedfracground
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Polycrystalline samples of NaYbO$_2$ are investigated by bulk magnetization and specific-heat measurements, as well as by nuclear magnetic resonance (NMR) and electron spin resonance (ESR) as local probes. No signatures of long-range magnetic order are found down to 0.3~K, evidencing a highly frustrated spin-liquid-like ground state in zero field. Above 2\,T, signatures of magnetic order are observed in thermodynamic measurements, suggesting the possibility of a field-induced quantum phase transition. The $^{23}$Na NMR relaxation rates reveal the absence of magnetic order and persistent fluctuations down to 0.3~K at very low fields and confirm the bulk magnetic order above 2~T. The $H$-$T$ phase diagram is obtained and discussed along with the existing theoretical concepts for layered spin-$\frac{1}{2}$ triangular-lattice antiferromagnets

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