Dynamic spin fluctuations in the frustrated A-site spinel CuAl2O4
Dynamic spin fluctuations in the frustrated A-site spinel CuAl2O4
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DOI：
10.1103/physrevb.102.014439
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发表时间：
2020-07-21
影响因子：
3.7
通讯作者：
Park, Je-Geun
中科院分区：
文献类型：
--
作者：
Cho, Hwanbeom;Nirmala, R.;Park, Je-Geun
利用核磁共振（NMR）和μ子自旋弛豫（mu SR）实验确定了受挫量子a位尖晶石CuAl2O4的磁基态。我们的结果证实基态不表现出长程磁有序，但在T* = 2.3K时表现出玻璃状跃迁。然而，在T*以下mu SR光谱的高斯形状和弱的纵向场依赖性表明基态存在动态自旋涨落，与传统自旋玻璃不同。
We performed nuclear magnetic resonance (NMR) and muon spin relaxation (mu SR) experiments to identify the magnetic ground state of the frustrated quantum A-site spinel, CuAl2O4. Our results verify that the ground state does not exhibit a long-range magnetic ordering, but a glasslike transition manifests at T* = 2.3K. However, the Gaussian shape and the weak longitudinal field dependence of mu SR spectra below T* show that the ground state has dynamic spin fluctuations, distinct from those of conventional spin glasses.