Magnetic properties and crystal field in Pr 2 Zr 2 O 7
Magnetic properties and crystal field in Pr 2 Zr 2 O 7
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Pr 2 Zr 2 O 7 的磁性和晶体场
DOI：
10.1103/physrevb.94.134428
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发表时间：
2016
影响因子：
3.7
通讯作者：
Bonville P
中科院分区：
文献类型：
--
作者：
Bonville P
在这项工作中，我们回顾了量子自旋-冰候选中作用于非Kramersion的晶场，使用了仅限于基自旋-轨道多重态和完全构型基础上的中间耦合态的标准计算。用极化中子衍射实验测定的多晶磁化率和局域磁化率的热变化分析表明，有效的反铁磁交换在低温下相对于其高温值被强烈地耗尽。然后我们讨论了由残余应变引起的晶场缺陷的影响，这对于非Kramers离子特别重要。我们发现它们是解释极低温度磁化曲线的重要因素，表明即使在8℃也没有达到饱和。此外，作为定性地理解在0.5℃以下观察到的类居里行为的可能候选者，我们讨论了磁性超精细相互作用的影响。
In this work, we revisit the crystal field acting on the non-Kramersionin the quantum spin-ice candidateusing both a standard calculation restricted to the ground spin-orbit multiplet and intermediate coupling states in the full basis of theconfiguration. Analysis of the thermal variation of the polycrystal magnetic susceptibility and of the local susceptibilitiesanddetermined by means of polarized neutron diffraction experiments reveals that the effective antiferromagnetic exchange is strongly depleted at low temperature with respect to its high-temperature value. We then discuss the influence of crystal field imperfections arising from residual strains, which are especially important for a non-Kramers ion. We find that they are an essential ingredient to account for the very low temperaturemagnetization curves, showing that the saturation is not achieved even at 8 T. Furthermore, as possible candidates to qualitatively understand the Curie-like behavior observed below 0.5 K, we discuss the influence of the magnetic hyperfine interaction.