Magnetic Order Induced by the Cooperation of Valence and Structural Instabilities in Eu1−xCaxCo2P2

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Journal of the Physical Society of Japan Pub Date : 2024-02-13 DOI:10.7566/jpsj.93.033702

Kodai Moriyama, Kohei Yoshinaga, Ryoichiro Matsui, Chishiro Michioka, Hiroaki Ueda, Kazuyoshi Yoshimura

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Abstract

Magnetism of layered compound Eu₁₋_xCa_xCo₂P₂ was investigated by means of magnetization, specific heat, and electrical resistivity measurements. It is found that Eu undergoes a phase transition from a divalent state to a mixed-valence state of Eu²⁺^δ and Eu⁽³⁻^δ^′)+ simultaneously with a structural transition from the uncollapsed tetragonal (ucT) phase to the collapsed tetragonal (cT) phase near x = 0.5. Whereas the compounds with the ucT structure exhibit antiferromagnetic ordering of Eu²⁺ moments, those with the cT structure exhibit additional magnetic ordering of Co moments. The ordering temperature of Co moments is much higher than those in other ACo₂P₂ systems with a divalent A cation. These results suggest that an electron-doping effect on Co 3d bands owing to the Eu valence transition stabilizes the magnetic ordering of Co moments.

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Eu1-xCaxCo2P2 中价态和结构不稳定性合作诱导的磁序

通过磁化、比热和电阻率测量，研究了层状化合物 Eu1-xCaxCo2P2 的磁性。研究发现，在 x = 0.5 附近，Eu 经历了从二价态到 Eu2+δ 和 Eu(3-δ′)+混合价态的相变，同时发生了从非塌缩四方（ucT）相到塌缩四方（cT）相的结构转变。具有 ucT 结构的化合物表现出 Eu2+ 矩的反铁磁排序，而具有 cT 结构的化合物则表现出 Co 矩的附加磁性排序。Co 矩的有序温度远高于其他含有二价 A 阳离子的 ACo2P2 系统。这些结果表明，Eu 价态转变对 Co 3d 带产生的电子掺杂效应稳定了 Co 矩的磁有序性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Physical Society of Japan 物理-物理：综合

CiteScore

3.40

自引率

17.60%

发文量

325

审稿时长

3 months

期刊介绍： The papers published in JPSJ should treat fundamental and novel problems of physics scientifically and logically, and contribute to the development in the understanding of physics. The concrete objects are listed below. Subjects Covered JPSJ covers all the fields of physics including (but not restricted to) Elementary particles and fields Nuclear physics Atomic and Molecular Physics Fluid Dynamics Plasma physics Physics of Condensed Matter Metal, Superconductor, Semiconductor, Magnetic Materials, Dielectric Materials Physics of Nanoscale Materials Optics and Quantum Electronics Physics of Complex Systems Mathematical Physics Chemical physics Biophysics Geophysics Astrophysics.