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arXiv 2010.06243cond-mat.str-el
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σ相Fe68V32化合物的磁性

Magnetism of Sigma-Phase Fe68V32 Compound

Piotr Konieczny, Stanisław M. Dubiel

摘要:

根据ZFC/FC磁化强度测量结果,确定了σ-Fe_(68)V_(32)在H-T坐标下的磁相图。磁性的重入特征,从顺磁性到铁磁性到自旋玻璃态,已经被证明。SG相是磁性不均匀的,因为可以识别两个子相,即具有强(SG-SI)和弱(SG-WI)不可逆性。用平均场论定量地分析了不可逆性T_irr和交叉温度T_cros,得到T_irr=1.6(2)和T_cros=0.91(9)。与Gabay-Toulouse模型定性一致。等温磁化强度测量点的软磁行为的研究样品。根据平均场论,用Kouvel-Fisher方法确定γ临界指数,得到γ=1.0(1)。

英文摘要:

The magnetic phase diagram in the H-T coordinates has been determined for σ-Fe68V32 from the ZFC/FC magnetization measurements. The re-entrant character of magnetism, going from paramagnetic through ferromagnetic to spin-glass (SG) states, has been evidenced. The SG phase is magnetically heterogeneous, because two sub phases can be identified i.e. with the strong (SG-SI) and the weak (SG-WI) irreversibility. The ireversibility, T_irr and the crossover, T_cros, temperatures were quantitatively analysed using the mean-field theory and ϕ_irr=1.6(2) and ϕ_cros=0.91(9) values were obtained. A qualitative agreement with the Gabay-Toulouse model was reached. The isothermal magnetization measurements point to a soft magnetic behaviour of the studied sample. The γ critical exponent was determined with the Kouvel-Fisher approach yielding the value of γ=1.0(1) in line with the mean-field theory.

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