LuCuGaO4中无序淬灭自旋液态的中子散射和muSR研究
Neutron scattering and muSR investigations of the spin liquid state with quenched disorder in LuCuGaO4
摘要：
LuCuGaO_4是由磁性Cu ~（2+）和抗磁性Ga ~（3+）离子组成的三角形双层膜，并发生了自旋玻璃转变，转变温度约为0.4K。使用muSR和中子散射测量，我们表明，在低温下，自旋形成了一个短程相关态，在很宽的时间尺度上可以检测到自旋波动：在0.05 K下，可以在muSR时间窗口中检测到磁波动，并且在非弹性中子散射响应中也可以检测到超过7 meV的磁波动，这表明磁波动跨越1 E-5和1 E-10秒之间的时间尺度。在整个测量温度范围内（0.05 - 50 K），动态磁化率的标度形式为α=1。这些效应与表面上完全不同的材料中的量子涨落和某种程度的结构无序有关，这些材料包括某些重费米子合金、可果美自旋液体、量子自旋玻璃和价键玻璃。因此，我们建议LuCuGaO 4是一个有趣的模型化合物，为进一步检查的无序和量子磁性。
英文摘要：
LuCuGaO4 has magnetic Cu2+ and diamagnetic Ga3+ ions distributed on a triangular bilayer and is suggested to undergo a spin-glass transition with T_g approximately 0.4 K. Using muSR and neutron scattering measurements, we show that at low temperature the spins form a short-range correlated state with spin fluctuations detectable over a wide range of timescales: at 0.05 K magnetic fluctuations can be detected in both the muSR time window and also extending beyond 7 meV in the inelastic neutron scattering response, indicating magnetic fluctuations spanning timescales between 1E-5 and 1E-10 seconds. The dynamical susceptibility scales according to the form χ''(ω)T^α, with α=1, throughout the measured temperature range (0.05 - 50 K). These effects are associated with quantum fluctuations and some degree of structural disorder in ostensibly quite different materials, including certain heavy fermion alloys, kagome spin liquids, quantum spin glasses, and valence bond glasses. We therefore suggest LuCuGaO4 is an interesting model compound for the further examination of disorder and quantum magnetism.
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