论文标题
零散的单极晶体，二聚体熵和库仑互动中的$ _2 $ ir $ _2 $ o $ _7 $
Fragmented monopole crystal, dimer entropy and Coulomb interactions in Dy$_2$Ir$_2$O$_7$
论文作者
论文摘要
粉末和单晶上的中子散射，比热和磁化测量结果表明，dy $ _2 $ ir $ _2 $ o $ $ _7 $实现了碎片的单极晶体状态，在该状态下，抗铁磁序和抗铁磁性和库仑相位相位旋转液体共生。如预测的那样，测得的残留熵是硬核二聚体液体的熵。包括库仑相互作用的包含可以对热力学数据和磁化动力学进行定量描述，并在出现的离子离子晶体中由脱合缺陷给出了能量尺度。我们的数据揭示了低能量激发，以及大量的能屏障至低温，而对施加场的磁反应表明，域壁固定很重要。需要进一步的理论建模的结果。
Neutron scattering, specific heat and magnetisation measurements on both powders and single crystals reveal that Dy$_2$Ir$_2$O$_7$ realizes the fragmented monopole crystal state in which antiferromagnetic order and a Coulomb phase spin liquid co-inhabit. The measured residual entropy is that of a hard core dimer liquid, as predicted. Inclusion of Coulomb interactions allows for a quantitative description of both the thermodynamic data and the magnetisation dynamics, with the energy scale given by deconfined defects in the emergent ionic crystal. Our data reveal low energy excitations, as well as a large distribution of energy barriers down to low temperatures, while the magnetic response to an applied field suggests that domain wall pinning is important; results that call for further theoretical modelling.
