Magnetic Order Induced by the Cooperation of Valence and Structural Instabilities in Eu1−xCaxCo2P2,Journal of the Physical Society of Japan

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Magnetic Order Induced by the Cooperation of Valence and Structural Instabilities in Eu1−xCaxCo2P2
Journal of the Physical Society of Japan ( IF 1.7 ) Pub Date : 2024-02-13 , DOI: 10.7566/jpsj.93.033702
Kodai Moriyama _{1,

2} , Kohei Yoshinaga ₁ , Ryoichiro Matsui ₁ , Chishiro Michioka ₁ , Hiroaki Ueda ₁ , Kazuyoshi Yoshimura _{1,

3}

Affiliation

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.

更新日期：2024-02-13

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