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首页> 外文期刊>Physical review >High-field magnetization and magnetoresistance of the A-site ordered perovskite oxide CaCu_3Ti_(4-x)Ru_xO_(12) (0 ≤ x ≤ 4)
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High-field magnetization and magnetoresistance of the A-site ordered perovskite oxide CaCu_3Ti_(4-x)Ru_xO_(12) (0 ≤ x ≤ 4)

机译:A位有序钙钛矿氧化物CaCu_3Ti_(4-x)Ru_xO_(12)(0≤x≤4)的高场磁化和磁阻

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We have measured high-field magnetization and magnetoresistance of polycrystalline samples of the A-site ordered perovskite CaCu_3Ti_(4-x)Ru_xO_(12) (0 ≤ x ≤ 4) utilizing a nondestructive pulsed magnet. We find that the magnetization for x = 0.5, 1.0, and 1.5 is nonlinear, and tends to saturate in high fields. This is highly nontrivial because the magnetization for x = 0 and 4 is linear in external field up to the highest one. We have analyzed this field dependence based on the thermodynamics of magnetic materials, and propose that the external fields delocalize the holes on the Cu~(2+) ions in order to maximize the entropy. This scenario is qualitatively consistent with a large magnetoresistance of -70% observed at 4.2 K at 52 T for x = 1.5.
机译:我们已经使用无损脉冲磁体测量了A位置有序钙钛矿CaCu_3Ti_(4-x)Ru_xO_(12)(0≤x≤4)的多晶样品的高场磁化强度和磁阻。我们发现x = 0.5、1.0和1.5的磁化强度是非线性的,并且在高磁场中趋于饱和。这是非常不平凡的,因为x = 0和4的磁化强度在外部磁场中直至最高磁场强度都是线性的。我们已经基于磁性材料的热力学分析了这种场依赖性,并建议外部场使Cu〜(2+)离子上的空穴离域,以使熵最大化。这种情况在质量上与x = 1.5时在4.2 K,52 T下观察到的-70%的大磁阻一致。

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