Superconducting behaviors in reduction-treated mixtures of fine Pr124 and Pr123 ceramics
Superconducting behaviors in reduction-treated mixtures of fine Pr124 and Pr123 ceramics
复制标题
精细 Pr124 和 Pr123 陶瓷经还原处理的混合物的超导行为
DOI：
10.1088/1742-6596/320/1/012077
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
R. Hagiwara
中科院分区：
文献类型：
--
作者：
K. Koyama;R. Nakashima;K. Magishi;T. Saito;T. Shima;R. Hagiwara
用电阻率和磁性测量方法研究了用柠檬酸盐热分解前驱体法合成的Pr 124和Pr 123细陶瓷经还原处理后的混合物的超导行为。随着Pr_（123）比例的增加，ρ（T）的温度依赖性发生了很大的变化，且Pr_（124）/Pr_（123）（1：1.5）和（1：2）烧结样品的ρ（T）没有宽的最大值，而（1：1）烧结样品的ρ（T）没有宽的最大值。还原处理后，Pr 124晶粒中CuO双链载流子浓度增加，ρ（T）曲线出现极大值。从磁化强度的温度关系中减去Pr 3+顺磁贡献，剩余磁化强度在低于17 K时表现出弱的抗磁性，表明Meissner效应很小。在20 Oe以下的测量磁场范围内，抗磁化率与磁场无关。
Superconducting behaviours in reduction-treated mixtures of fine Pr124 and Pr123 ceramics synthesized using citrate pyrolysis precursor method are examined by electrical resistivity and magnetic measurements. With increasing the ratio of Pr123, the temperature dependence of ρ (T) changes to be semiconductor-like behaviour hugely, and there exist no broad maximum for as-sintered Pr124/Pr123 (1: 1.5) and (1: 2) samples contrary with the case of (1: 1). By reduction treatment, the ρ (T) curve shows the maximum according to the increase of carrier concentration in the CuO double chain in Pr 124 grains. By subtracting the Pr 3+ paramagnetic contribution from the temperature dependence of magnetization, the remnant magnetization shows weak diamagnetism below∼ 17 K, indicating small Meissner effect. The diamagnetic susceptibility is independent of magnetic field in the measured field range below 20 Oe.