Neutron diffraction and critical behavior study on (Mn, Co)2Sn single crystals

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER Physica B-condensed Matter Pub Date : 2025-03-03 DOI:10.1016/j.physb.2025.417113

Shaohua Fan , Baochun Wu , Xiaobai Ma , Jianxiang Gao , Zhimeng Liu , Wenyun Yang , Zhongchong Lin , Yanli Li , Zhaochu Luo , Changsheng Wang , Shunquan Liu , Dongfeng Chen , Jinbo Yang , Honglin Du

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Abstract

In this study, the structure and exchange interaction of Ni₂In type (P6₃/mmc) (Mn, Co)₂Sn single crystals were investigated using neutron diffraction, bulk magnetization, and the first-principle calculation. In Mn_1.8Co_0.2Sn, Co occupies only the 2d site and the magnetic cell is doubled along the c axis below T_t. Although the M_s, T_c, T_t, -ΔS_M^max, and RCP of Mn_1.8Co_0.2Sn are lower than that of Mn₂Sn, Mn_1.8Co_0.2Sn enhances the magnetocrystalline anisotropy and coercivity. The critical exponents and T_c were determined (β = 0.417, γ = 1.189, δ = 3.852, T_c = 232 K for Mn₂Sn. β = 0.532, γ = 1.387, δ = 3.607, T_c = 130 K for Mn_1.8Co_0.2Sn). The critical behaviors indicate that Co doping improves the spin dimensionality and enlarges the range of spin interactions. The results of first-principle calculations show that there is a strong positive exchange interaction between the 3d electrons of Mn1 and Co.

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces