Ye Linda, Sorensen Matthew E, Bachmann Maja D, Fisher Ian R
Department of Applied Physics, Stanford University, Stanford, CA, USA.
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA.
Nat Commun. 2024 Aug 14;15(1):7005. doi: 10.1038/s41467-024-51269-x.
Revealing the presence of magnetic octupole order and associated octupole fluctuations in solids is a highly challenging task due to the lack of simple external fields that can couple to magnetic octupoles. Here, we demonstrate a methodology for probing the magnetic octupole susceptibility of a candidate material, PrVAl, using a product of magnetic field H and shear strain ϵ as a composite effective field, while employing an adiabatic elastocaloric effect to probe the response. We observe Curie-Weiss behavior in the obtained octupolar susceptibility down to approximately 3 K. Although octupole order does not appear to be the leading multipolar channel in PrVAl, our results nevertheless reveal the presence of strong magnetic octupole fluctuations and hence demonstrate that octupole order is at least a competing state. More broadly, our results highlight how anisotropic strain can be combined with magnetic fields to probe elusive 'hidden' electronic orders.
由于缺乏能与磁八极子耦合的简单外场，揭示固体中磁八极序及相关八极涨落的存在是一项极具挑战性的任务。在此，我们展示了一种方法，通过使用磁场H与剪切应变ϵ的乘积作为复合有效场来探测候选材料PrVAl的磁八极磁化率，同时利用绝热弹性热效应来探测响应。我们观察到在获得的八极磁化率中，直至约3 K都呈现居里 - 外斯行为。尽管八极序似乎不是PrVAl中的主导多极通道，但我们的结果仍揭示了强磁八极涨落的存在，从而证明八极序至少是一种竞争态。更广泛地说，我们的结果突出了各向异性应变如何能与磁场相结合，以探测难以捉摸的“隐藏”电子序。
