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arXiv 2601.00749cond-mat.str-el
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关于Tb₂Ir₂O₇磁基态起源的研究

Origin of the magnetic ground state of Tb$_{2}$Ir$_{2}$O$_{7}$

Université Grenoble Alpes(格勒诺布尔阿尔卑斯大学);CNRS(法国国家科学研究中心);Institut Néel(内尔研究所);Institut Laue Langevin(朗之万-劳厄研究所);Laboratoire Léon Brillouin(莱昂·布里渊实验室);CEA(法国原子能和替代能源委员会);Université Paris-Saclay(巴黎萨克雷大学)

Y. Alexanian, E. Lhotel, J. Robert, S. Petit, E. Lefrançois, P. Lejay, A. Hadj-Azzem, F. Damay, J. Ollivier, B. Fåk, S. De Brion, R. Ballou, V. Simonet

AI总结:

本研究通过中子散射和比热测量揭示Tb₂Ir₂O₇在1.5K下的独特磁态,并发现双线性相互作用需补充才能完全解释实验结果。

摘要:

磁性稀土钙钛矿铱酸盐表现出丰富的非常规相变,这些相变由稀土和铱亚晶格内的复杂相互作用驱动。在本研究中,我们研究了Tb₂Ir₂O₇的奇特磁态,其中Tb³+的磁矩沿其局部各向异性轴垂直排列。通过中子衍射和非弹性中子散射到稀释温度,结合比热测量,我们证明这种奇特的磁态在1.5 K时完全建立,并且我们表征了其在广阔能量范围内的激发光谱。我们的计算表明,Tb³+离子之间的双线性相互作用受Ir分子场影响,捕捉了实验中的几个关键特征,但需要补充才能完全重现观察到的行为。

英文摘要:

Magnetic-rare-earth pyrochlore iridates exhibit a rich variety of unconventional phases, driven by the complex interactions within and between the rare-earth and the iridium sublattices. In this study, we investigate the peculiar magnetic state of Tb$_{2}$Ir$_{2}$O$_{7}$, where a component of the Tb$^{3+}$ moment orders perpendicular to its local Ising anisotropy axis. By means of neutron diffraction and inelastic neutron scattering down to dilution temperatures, complemented by specific heat measurements, we show that this intriguing magnetic state is fully established at 1.5 K and we characterize its excitation spectrum across a broad range of energies. Our calculations reveal that bilinear interactions between Tb$^{3+}$ ions subjected to the Ir molecular field capture several key features of the experiments, but need to be supplemented to fully reproduce the observed behavior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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