In the present studies, we have explored the nature of magnetic transition, critical magnetization scaling, and magnetocaloric effect of Zintl phase single crystalline EuIn2 X2 (X = P, As) compounds synthesized by flux-method. The magnetization susceptibilities of the two compounds revealed the ferromagnetically ordered Eu2+ moment below 24 K in EuIn2P2 while in EuIn2As2 Eu2+ moment couple antiferromagnetically below 16.3 K. A comprehensive study of the magnetization data is performed in the critical regime utilizing modified Arrott plots (MAP), the Kouvel-Fisher (KF) method, universal curve scaling, and the magnetocaloric effect. For EuIn2P2, the magnetization isotherms follow MAP with critical exponents β = 0.257, γ = 0.86, and δ = 4.45 for the magnetic field applied along the c-axis (H||c) and β = 0.226, γ = 1.10, and δ = 5.87 for the magnetic field applied along the ab-plane (H||ab). For EuIn2As2, the values are β = 0.245, γ = 0.81, and δ = 4.31 and β = 0.244, γ = 0.89, and δ = 4.65 for H||c and H||ab plane, respectively. The Kouvel-Fisher and universal scaling plots of the magnetization isotherms further corroborated the reliability of our analysis and the exponents’ values. A reasonable magnetocaloric effect -ΔSm = 9.55 Jkg−1K−1 and 10.80 Jkg−1K−1 for 5T magnetic field change is observed for H||c and H||ab plane for EuIn2P2, respectively. The values of -ΔSm for EuIn2As2 are 10.40 Jkg−1K−1 and 12.75 Jkg−1K−1 for H||c and H||ab plane. The critical exponents derived from the magnetocaloric effect (MCE) are n = 0.49(5), 0.45(3) and δ = 5.17(4), 5.74(1) for EuIn2P2 and n = 0.33(1), 0.34(2) and δ = 5.08(5), 6.54(6), respectively for H||c and H||ab plane for EuIn2P2 and EuIn2As2. The exponents derived from the MCE are marginally elevated, but they remain in substantial concordance with the values inferred from the magnetic isotherm study.

Critical exponents and magnetocaloric response in Zintl phase EuIn₂ X₂ (X = As, P)

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2025年11月21日

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Qurat Ul Ain,
W. Pervez,
K. Synoradzki,
T. Toliński

摘要

In the present studies, we have explored the nature of magnetic transition, critical magnetization scaling, and magnetocaloric effect of Zintl phase single crystalline EuIn₂ X₂ (X = P, As) compounds synthesized by flux-method. The magnetization susceptibilities of the two compounds revealed the ferromagnetically ordered Eu²⁺ moment below 24 K in EuIn₂P₂ while in EuIn₂As₂ Eu²⁺ moment couple antiferromagnetically below 16.3 K. A comprehensive study of the magnetization data is performed in the critical regime utilizing modified Arrott plots (MAP), the Kouvel-Fisher (KF) method, universal curve scaling, and the magnetocaloric effect. For EuIn₂P₂, the magnetization isotherms follow MAP with critical exponents β = 0.257, γ = 0.86, and δ = 4.45 for the magnetic field applied along the c-axis (H||c) and β = 0.226, γ = 1.10, and δ = 5.87 for the magnetic field applied along the ab-plane (H||ab). For EuIn₂As₂, the values are β = 0.245, γ = 0.81, and δ = 4.31 and β = 0.244, γ = 0.89, and δ = 4.65 for H||c and H||ab plane, respectively. The Kouvel-Fisher and universal scaling plots of the magnetization isotherms further corroborated the reliability of our analysis and the exponents’ values. A reasonable magnetocaloric effect -ΔS_m = 9.55 Jkg⁻¹K⁻¹ and 10.80 Jkg⁻¹K⁻¹ for 5T magnetic field change is observed for H||c and H||ab plane for EuIn₂P₂, respectively. The values of -ΔS_m for EuIn₂As₂ are 10.40 Jkg⁻¹K⁻¹ and 12.75 Jkg⁻¹K⁻¹ for H||c and H||ab plane. The critical exponents derived from the magnetocaloric effect (MCE) are n = 0.49(5), 0.45(3) and δ = 5.17(4), 5.74(1) for EuIn₂P₂ and n = 0.33(1), 0.34(2) and δ = 5.08(5), 6.54(6), respectively for H||c and H||ab plane for EuIn₂P₂ and EuIn₂As₂. The exponents derived from the MCE are marginally elevated, but they remain in substantial concordance with the values inferred from the magnetic isotherm study.

Critical exponents and magnetocaloric response in Zintl phase EuIn2 X2 (X = As, P)

摘要

Critical exponents and magnetocaloric response in Zintl phase EuIn₂ X₂ (X = As, P)