The strongly anisotropic g factors of Yb3+ in NaYbS2 and NaYbO2 are controlled mainly by the charge contrast between in-plane Yb3+ neighbors and inter-layer Na+ ions, with a more homogeneous cation environment yielding nearly isotropic g factors.
Gapless spin-liquid state in the structurally disorder-free triangular antiferromagnet NaYbO$_2$
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abstract
We present the structural characterization and low-temperature magnetism of the triangular-lattice delafossite NaYbO$_2$. Synchrotron x-ray diffraction and neutron scattering exclude both structural disorder and crystal-electric-field randomness, whereas heat-capacity measurements and muon spectroscopy reveal the absence of magnetic order and persistent spin dynamics down to at least 70\,mK. Continuous magnetic excitations with the low-energy spectral weight accumulating at the $K$-point of the Brillouin zone indicate the formation of a novel spin-liquid phase in a triangular antiferromagnet. This phase is gapless and shows a non-trivial evolution of the low-temperature specific heat. Our work demonstrates that NaYbO$_2$ practically gives the most direct experimental access to the spin-liquid physics of triangular antiferromagnets.
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Single-site magnetic anisotropy governed by inter-layer cation charge imbalance in triangular-lattice AYbX$_2$
The strongly anisotropic g factors of Yb3+ in NaYbS2 and NaYbO2 are controlled mainly by the charge contrast between in-plane Yb3+ neighbors and inter-layer Na+ ions, with a more homogeneous cation environment yielding nearly isotropic g factors.