Journal
PHYSICAL REVIEW B
Volume 99, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.180401
Keywords
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 1143]
- HLD at HZDR
- Federal Ministry for Education and Research through the Sofja Kovalevskaya Award of Alexander von Humboldt Foundation
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Polycrystalline samples of NaYbO2 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 Na-23 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-1/2 triangular-lattice antiferromagnets.
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