Structural distortions tailor magnetic and magnetocaloric response in Ho2NiTiO6

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-06-28 DOI:10.1016/j.matlet.2025.138993

Sk. Anirban , Samarendra Nath Saha , Rosni Roy , Rajib Mondal

引用次数: 0

Abstract

Ho₂NiTiO₆, a double perovskite, crystallizes in a monoclinic (P2₁/n) structure with significant Jahn-Teller distortion (Δd = 9.4 %) in NiO₆ octahedra. XPS confirms high-spin Ni²⁺ (

t_{2 g}^{6} e_{g}^{2}

) and Ti⁴⁺ (3d⁰) states. Magnetic measurements reveal ferromagnetic to paramagnetic transition at T_N ≈ 5.5 K and dominant AFM interactions (

θ_{CW}

= − 10.9 K). A broad magnetocaloric entropy change arises from spin-lattice coupling and frustrated Ni–O–Ti geometries. The relative cooling power scales as RCP ∝ H^1.24, reflecting magnetic anisotropy and thermal fluctuations, highlighting potential of Ho₂NiTiO₆ for cryogenic magnetic refrigeration.

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结构畸变可调整Ho2NiTiO6的磁和磁热响应

Ho2NiTiO6是一种双钙钛矿，在NiO6八面体中结晶为单斜晶（P21/n）结构，具有明显的Jahn-Teller畸变（Δd = 9.4%）。XPS证实了高自旋Ni2+ (t2g6eg2)和Ti4+ (3d0)态。磁测量结果显示，在TN≈5.5 K处铁磁向顺磁转变，并有优势的AFM相互作用（θCW =−10.9 K）。广泛的磁热熵变化是由自旋-晶格耦合和受挫的Ni-O-Ti几何引起的。相对制冷功率以RCP∝H1.24表示，反映了磁各向异性和热波动，突出了Ho2NiTiO6在低温磁制冷方面的潜力。

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

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

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