Cooling Fields Induced Giant Magnetoresistance in High-Pressure Synthesized Double Perovskite Y2NiIrO6
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摘要: 双钙钛矿材料Y2NiIrO6的亚铁磁转变温度为192 K，因其奇异的交换偏置效应而受到广泛关注。系统研究了Y2NiIrO6的低温晶体结构、电导行为及磁电阻性能，发现该材料在130 K时保持了290 K时的晶体结构，并在130～300 K的温区内表现出半导体电导行为。在居里温度以上的顺磁状态，其导电行为可以用Efros-Shklovskii变程跃迁模型拟合，在居里温度以下，亚铁磁有序使电阻行为偏离该模型。更为有趣的是，亚铁磁序诱导了材料的负磁电阻效应，并且7.0 T的场冷诱导了–10%的巨磁电阻效应。这一新机制为探索新型巨磁电阻材料提供了全新的研究思路。Abstract: Double perovskite Y2NiIrO6 is a ferrimagnetic material with Curie temperature of 192 K. It has drawn wide attention owing to its remarkable exchange-bias effect. Here, we studied the low-temperature crystal structure, electron transport properties and magnetoresistance of Y2NiIrO6. The crystal structure under 130 K is almost identical with that of room-temperature. The material shows semiconducting behavior in the temperature range of 130 to 300 K. Above Curie temperature it can be well describe as Efros-Shklovskii variable-range hopping model. Below Curie temperature, a departure occurs due to the forming of long-range ferrimagnetic ordering. It is interesting to find that the magnetic ordering results into negative magneto-resistance. Moreover, giant magnetoresistance up to –10% is induced by cooling field of 7.0 T. This mechanism of this remarkable effect provides a new boulevard to discover new type of giant magneto-resistance materials.
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图 1 YNIO在290和130 K的XRD谱及Rietveld精修结果
Figure 1. XRD spectra and the corresponding Rietveld refinements of YNIO at 290 and 130 K
图 2 0.5 T外场下磁矩随温度的变化曲线
Figure 2. Temperature dependence of magnetization under external field of 0.5 T
图 3 130 K下经历零场冷、0.5 T场冷和7.0 T场冷后的磁滞回线
Figure 3. Field dependence of magnetization after zero field cooling, field cooling of 0.5 and 7.0 T at 130 K
图 4 不同磁场下YNIO的电阻率-温度变化曲线
Figure 4. Temperature dependence of resistivity of YNIO under different fields
图 5 零场下ρ(T)的变程跃迁拟合
Figure 5. Fitting of Efros-Shklovskii variable-rangehopping at zero field cooling
图 6 零场冷和7.0 T场冷下磁电阻随温度的变化
Figure 6. Temperature dependence of magnetoresistance under ZFC and FC at 7.0 T
图 7 130 K时零场冷、0.5 T场冷和7.0 T场冷后磁电阻与温度的变化曲线
Figure 7. Field dependence of magnetoresistance after zero field cooling, field cooling of 0.5 and 7.0 T at 130 K
表 1 YNIO在290和130 K下的晶格参数
Table 1. Structural parameters of YNIO at 290 and 130 K
T/K Space group a/Å b/Å c/Å β/(o) B'-B'' antisite/% 290 P21/n 5.265 2 5.684 7 7.584 6 90.14 7.5 130 P21/n 5.263 1 5.683 0 7.580 9 90.16 7.5 T/K Position Y Ni Ir O1 O2 O3 290 0.021 8, 0.077 5
0.249 01/2, 0, 1/2 1/2, 0, 0 0.184 3, –0.191 4,
0.055 30.619 5, –0.042 6,
0.254 70.323 3, 0.307 3,
0.059 8130 0.022 1, 0.078 8,
0.249 11/2, 0, 1/2 1/2, 0, 0 0.183 9, –0.189 3,
0.051 70.618 4, –0.047 1,
0.253 30.322 2, 0.308 0,
0.061 2
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