结构无无序三角形反铁磁体NaYbO $_2$中的无隙自旋液体态
Gapless spin-liquid state in the structurally disorder-free triangular antiferromagnet NaYbO$_2$
摘要：
我们提出了三角晶格铜铁矿NaYbO $_2$的结构表征和低温磁性。同步加速器X射线衍射和中子散射排除了结构无序和晶体电场随机性，而热容测量和μ子光谱揭示了至少在70 mK以下不存在磁有序和持续的自旋动力学。连续的磁激发与低能量谱权重积累在$K$ -点的布里渊区表明一种新的自旋液相的形成在三角形反铁磁体。这一阶段是无隙的，并显示出一个非平凡的演变的低温比热。我们的工作表明，NaYbO $_2$实际上提供了最直接的实验访问的三角形反铁磁体的自旋液体物理。
英文摘要：
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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