Constraints on 5f-electron magnetism in Ga-stabilized δ-Pu from x-ray magnetic circular dichroism,Physical Review B

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Constraints on 5f-electron magnetism in Ga-stabilized δ-Pu from x-ray magnetic circular dichroism
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-10 , DOI: 10.1103/physrevb.110.104417
Alexander A. Baker ₁ , Gilberto Fabbris ₂ , Daniel Haskel ₂ , Jason R. Jeffries ₁

Affiliation

Density-functional theory models of δ-Pu accurately predict crystal structure, phonon density of states, and unit cell volumes but require magnetic degrees of freedom which have never been experimentally verified. Some models invoke an on-site cancellation of spin and orbital moments, engendering a near-zero bulk magnetization, undetectable by most probes. Here, we employ x-ray magnetic circular dichroism at the Pu

M_{4, 5}

edges to directly probe spin and orbital moments using the magneto-optical sum rules. The data show no dichroism within experimental error, constraining polarized moments at 6 T and 3 K to

μ_{L, S} < 0.1 μ_{B}

. These experiments point to the absence of even unconventional spin-orbit compensated order in δ-Pu.

中文翻译：

X 射线磁圆二色性对 Ga 稳定 δ-Pu 中 5f 电子磁性的约束

δ -Pu 的密度泛函理论模型可以准确预测晶体结构、声子态密度和晶胞体积，但需要从未经过实验验证的磁自由度。一些模型调用自旋和轨道矩的现场抵消，产生接近于零的体磁化强度，大多数探测器无法检测到。在这里，我们在 Pu 处采用 X 射线磁圆二色性