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  • Received: Aug. 12, 2019

    Accepted: --

    Posted: Sep. 17, 2020

    Published Online: Sep. 17, 2020

    The Author Email: Yu Xiao-Yang (xtshuai2006@163.com)

    DOI: 10.7498/aps.68.20191221

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    Xiao-Yang Yu, Hong-Lei Feng, Gang-Xu Gu, Yong-He Liu, Zhi-Lin Li, Tong-Shuai Xu, Yong-Qing Li. Andreev reflection spectroscopy of ferromagnetic Fe0.26TaS2 with layered structure [J]. Acta Physica Sinica, 2019, 68(24): 247201-1

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Magnetization measurement results of Fe0.26TaS2: (a) Magnetization measurement with ZFC and FC process while H⊥ab, the measurement field is 100 Oe; (b) magnetization measurement with ZFC and FC process while H//ab, the measurement field is 100 Oe; (c) isothermal magnetization measurements for H⊥ab; (d) isothermal magnetization measurements for H//ab. For clarify, the data is shift equally in Fig. 1(d).Fe0.26TaS2单晶样品的磁性测量结果 (a) 外加磁场垂直于ab面(H⊥ab)时的FC和ZFC磁化曲线, 测量磁场为100 Oe (1 Oe = 103/(4π) A/m); (b)外加磁场平行于ab面时 (H//ab)的FC和ZFC磁化曲线, 测量磁场为100 Oe; (c) H⊥ab的等温磁化曲线随外加磁场的变化; (d) H//ab的等温磁化曲线随外加磁场的变化(为清楚起见, 在垂直方向做了等间距平移)

Fig. 1. Magnetization measurement results of Fe0.26TaS2: (a) Magnetization measurement with ZFC and FC process while Hab, the measurement field is 100 Oe; (b) magnetization measurement with ZFC and FC process while H//ab, the measurement field is 100 Oe; (c) isothermal magnetization measurements for Hab; (d) isothermal magnetization measurements for H//ab. For clarify, the data is shift equally in Fig. 1(d). Fe0.26TaS2单晶样品的磁性测量结果 (a) 外加磁场垂直于ab面(Hab)时的FC和ZFC磁化曲线, 测量磁场为100 Oe (1 Oe = 103/(4π) A/m); (b)外加磁场平行于ab面时 (H//ab)的FC和ZFC磁化曲线, 测量磁场为100 Oe; (c) Hab的等温磁化曲线随外加磁场的变化; (d) H//ab的等温磁化曲线随外加磁场的变化(为清楚起见, 在垂直方向做了等间距平移)

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Isothermal magnetization and temperature dependence of resistance of Fe0.26TaS2: (a) Arrot plot for isothermal magnetization in H⊥ab; (b) temperature dependence of resistance.Fe0.26TaS2等温磁化曲线和电阻-温度曲线(1 emu = 10–3 A·m2) (a) H⊥ab方向Fe0.26TaS2等温磁化曲线的Arrott图, 居里温度为115 K; (b) Fe0.26TaS2的电阻-温度曲线

Fig. 2. Isothermal magnetization and temperature dependence of resistance of Fe0.26TaS2: (a) Arrot plot for isothermal magnetization in H⊥ab; (b) temperature dependence of resistance. Fe0.26TaS2等温磁化曲线和电阻-温度曲线(1 emu = 10–3 A·m2) (a) H⊥ab方向Fe0.26TaS2等温磁化曲线的Arrott图, 居里温度为115 K; (b) Fe0.26TaS2的电阻-温度曲线

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Magnetic field dependence of magnetoresistance and Hall effect: (a) Magnetic field dependence of magnetoresistance, H⊥ab; (b) magnetic field dependence of magnetoresistance, H//ab; (c) magnetic field dependence of Hall effect, H⊥ab; (d) magnetic field dependence of Hall effect, H//ab.磁电阻和霍尔电阻随外加磁场的变化 (a) H⊥ab时, 磁电阻随外加磁场的变化; (b) H//ab时, 磁电阻随外加磁场的变化; (c) H⊥ab时, 霍尔电阻随外加磁场的变化; (d) H//ab时, 霍尔电阻随外加磁场的变化

Fig. 3. Magnetic field dependence of magnetoresistance and Hall effect: (a) Magnetic field dependence of magnetoresistance, Hab; (b) magnetic field dependence of magnetoresistance, H//ab; (c) magnetic field dependence of Hall effect, Hab; (d) magnetic field dependence of Hall effect, H//ab. 磁电阻和霍尔电阻随外加磁场的变化 (a) Hab时, 磁电阻随外加磁场的变化; (b) H//ab时, 磁电阻随外加磁场的变化; (c) Hab时, 霍尔电阻随外加磁场的变化; (d) H//ab时, 霍尔电阻随外加磁场的变化

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Andreev reflection spectroscopy of Fe0.26TaS2/Pb: (a) Normalization of Andreev reflection spectroscopy from T = 2 K to 8 K; (b) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 1.6 K; (c) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 2 K; (d) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 4 K. The black dot is experimental data and red line is fitting.Fe0.26TaS2/Pb的Andreev反射谱 (a)不同温度下Andreev结的归一化微分电导谱; (b) T = 1.6 K, 修正的BTK理论对微分电导谱的拟合结果; (c) T = 2 K, 修正的BTK理论对微分电导谱的拟合结果; (d) T = 4 K, 修正的BTK理论对微分电导谱的拟合结果. 黑色点为实验数据, 红色线为理论计算结果

Fig. 4. Andreev reflection spectroscopy of Fe0.26TaS2/Pb: (a) Normalization of Andreev reflection spectroscopy from T = 2 K to 8 K; (b) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 1.6 K; (c) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 2 K; (d) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 4 K. The black dot is experimental data and red line is fitting. Fe0.26TaS2/Pb的Andreev反射谱 (a)不同温度下Andreev结的归一化微分电导谱; (b) T = 1.6 K, 修正的BTK理论对微分电导谱的拟合结果; (c) T = 2 K, 修正的BTK理论对微分电导谱的拟合结果; (d) T = 4 K, 修正的BTK理论对微分电导谱的拟合结果. 黑色点为实验数据, 红色线为理论计算结果

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Andreev reflection spectroscopy of Fe0.26TaS2/Al/Pb: (a) Normalization of Andreev reflection reflection spectroscopy from T = 0.36 K to 9 K; (b) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 0.36 K; (c) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 1 K; (d) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 6 K. The black dot is experimental data and red line is fitting. Spin polarization is fixed to none-zero (P ≠ 0).Fe0.26TaS2/Al/Pb异质结的Andreev反射谱 (a)不同温度下的归一化微分电导谱; (b) T = 0.36 K, 修正的BTK理论对微分电导谱的拟合结果; (c) T = 1 K, 修正的BTK理论对微分电导谱的拟合结果; (d) T = 6 K, 修正的BTK理论对微分电导谱的拟合结果; 黑色点为实验数据, 红色线为理论计算结果, 自旋极化率P ≠ 0

Fig. 5. Andreev reflection spectroscopy of Fe0.26TaS2/Al/Pb: (a) Normalization of Andreev reflection reflection spectroscopy from T = 0.36 K to 9 K; (b) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 0.36 K; (c) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 1 K; (d) modified BTK fitting for normalized Andreev reflection spectroscopy, T = 6 K. The black dot is experimental data and red line is fitting. Spin polarization is fixed to none-zero (P ≠ 0). Fe0.26TaS2/Al/Pb异质结的Andreev反射谱 (a)不同温度下的归一化微分电导谱; (b) T = 0.36 K, 修正的BTK理论对微分电导谱的拟合结果; (c) T = 1 K, 修正的BTK理论对微分电导谱的拟合结果; (d) T = 6 K, 修正的BTK理论对微分电导谱的拟合结果; 黑色点为实验数据, 红色线为理论计算结果, 自旋极化率P ≠ 0

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Modified BTK fitting for normalized Andreev reflection spectroscopy of Fe0.26TaS2/Al/Pb: (a) T = 0.36 K; (b) T = 1 K; (c) T = 3 K; (d) T = 6 K. The black dot is experimental data and the red line is fitting. Spin polarization is fixed to zero (P = 0).修正的BTK理论对不同温度下微分电导谱的拟合结果 (a) T = 0.36 K; (b) T = 1 K; (c) T = 3 K; (d) T = 6 K; 黑色点为实验数据, 红色线为理论计算结果; 自旋极化率固定为零(P = 0)

Fig. 6. Modified BTK fitting for normalized Andreev reflection spectroscopy of Fe0.26TaS2/Al/Pb: (a) T = 0.36 K; (b) T = 1 K; (c) T = 3 K; (d) T = 6 K. The black dot is experimental data and the red line is fitting. Spin polarization is fixed to zero (P = 0). 修正的BTK理论对不同温度下微分电导谱的拟合结果 (a) T = 0.36 K; (b) T = 1 K; (c) T = 3 K; (d) T = 6 K; 黑色点为实验数据, 红色线为理论计算结果; 自旋极化率固定为零(P = 0)

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Andreev reflection spectroscopy of Fe0.26TaS2//NbSe2: (a) Normalization of Andreev reflection spectroscopy from T = 1.7 K to 8 K; (b) modified BTK fitting for normalized Andreev reflection spectroscopy at T = 4 K; (c) modified BTK fitting for normalized Andreev reflection spectroscopy at T = 1.7 K; (d) modified BTK fitting respectively for negative bias or positive bias Andreev reflection spectroscopy at T = 1.7 K. The black dot is experimental data and red line is fitting.Fe0.26TaS2/NbSe2的Andreev反射谱 (a)不同温度下的归一化微分电导谱和修正的BTK拟合; (b) T = 4 K的微分电导谱和修正的BTK拟合; (c) T = 1.7 K下, 负偏压的归一化微分电导谱及修正的BTK拟合; (d) T = 1.7 K下, 正偏压的归一化微分电导谱及修正的BTK拟合; 黑色点为实验数据, 红色线为理论计算结果

Fig. 7. Andreev reflection spectroscopy of Fe0.26TaS2//NbSe2: (a) Normalization of Andreev reflection spectroscopy from T = 1.7 K to 8 K; (b) modified BTK fitting for normalized Andreev reflection spectroscopy at T = 4 K; (c) modified BTK fitting for normalized Andreev reflection spectroscopy at T = 1.7 K; (d) modified BTK fitting respectively for negative bias or positive bias Andreev reflection spectroscopy at T = 1.7 K. The black dot is experimental data and red line is fitting. Fe0.26TaS2/NbSe2的Andreev反射谱 (a)不同温度下的归一化微分电导谱和修正的BTK拟合; (b) T = 4 K的微分电导谱和修正的BTK拟合; (c) T = 1.7 K下, 负偏压的归一化微分电导谱及修正的BTK拟合; (d) T = 1.7 K下, 正偏压的归一化微分电导谱及修正的BTK拟合; 黑色点为实验数据, 红色线为理论计算结果

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