Evidence for a dynamical ground state in the frustrated pyrohafnate Tb 2 Hf 2 O 7

Evidence for a dynamical ground state in the frustrated pyrohafnate Tb 2 Hf 2 O 7
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受挫焦铪酸盐 Tb 2 Hf 2 O 7 中动态基态的证据

DOI:
10.1103/physrevb.97.094402
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Anand V
Anand V
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Anand V

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我们基于交流磁化率、直流磁化率、等温磁化强度和热容测量,结合μ子自旋弛豫()和中子粉末衍射测量,报道了的物理性质。在0.1K以下没有发现长程磁序的证据。然而,数据提出了一个频率依赖性的宽峰(在16 Hz附近0.9 K),表明慢自旋动力学。慢自旋动力学进一步证明从数据(特征在于拉伸指数行为),显示持续自旋波动低至0.3 K。在0.1 K下收集的中子粉末衍射数据显示出磁源(漫散射)的宽峰,但没有磁布拉格峰。漫散射数据的分析揭示了一个占主导地位的反铁磁相互作用与负的韦斯温度。长程磁序的缺乏和慢自旋动力学和持续自旋涨落的存在一起反映了动力学基态。
We report the physical properties ofbased on ac magnetic susceptibility, dc magnetic susceptibility, isothermal magnetization, and heat capacitymeasurements combined with muon spin relaxation () and neutron powder diffraction measurements. No evidence for long-range magnetic order is found down to 0.1 K. However,data present a frequency-dependent broad peak (near 0.9 K at 16 Hz) indicating slow spin dynamics. The slow spin dynamics is further evidenced from thedata (characterized by a stretched exponential behavior) which show persistent spin fluctuations down to 0.3 K. The neutron powder diffraction data collected at 0.1 K show a broad peak of magnetic origin (diffuse scattering) but no magnetic Bragg peaks. The analysis of the diffuse scattering data reveals a dominant antiferromagnetic interaction in agreement with the negative Weiss temperature. The absence of long-range magnetic order and the presence of slow spin dynamics and persistent spin fluctuations together reflect a dynamical ground state in.
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