Influence of Sample Preparation Technology and Treatment on Magnetism and Superconductivity of UCoGe
Influence of Sample Preparation Technology and Treatment on Magnetism and Superconductivity of UCoGe
复制标题
样品制备工艺及处理对UCoGe磁性和超导性的影响
DOI：
10.1143/jpsj.80.084709
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发表时间：
2011
影响因子：
1.7
通讯作者：
V. Sechovský
中科院分区：
文献类型：
--
作者：
J. Pospíšil;K. Prokeš;M. Reehuis;M. Tovar;J. Vejpravová;J. Prokleška;V. Sechovský
铁磁超导体UCoGe是一种弱铁磁体，居里相变温度T_C为2.5K。在超导临界温度T_（SC）≤ 0.7 K时，磁有序与超导性共存.然而，上述物理现象的奇异共存强烈依赖于样本，只有少数样本可以引以为豪。我们用提拉法和浮区法制备了一系列多晶样品和单晶。样品在真空下通过标准退火处理或使用固态电迁移进行精制。所有样品进行了仔细的X射线和中子衍射方法，并通过电子色散X射线分析在扫描电子显微镜。随后还通过电阻率、磁化强度、交流磁化率和比热测量研究了它们的磁性和超导性。对结果进行了分析，并探讨了样品质量、样品质量与样品质量的关系。
Ferromagnetic superconductor UCoGe is reported to be a week ferromagnet with Curie phase transition temperature T C ≈2.5 K. The magnetic order coexists with superconductivity that appears below critical temperature T SC ≈0.7 K. Nevertheless, the exotic coexistence of the mentioned physical phenomena is strongly sample dependent and only few samples can take pride in thereby. We have prepared a series of polycrystalline samples and single crystals using Czochralski and floating zone method. The samples were treated by a standard annealing under the vacuum or refined using solid state electrotransport. All samples were carefully characterized by X-ray and neutron diffraction methods and by electron-dispersive X-ray analysis in a scanning electron microscope. They were subsequently also studied with respect to magnetism and superconductivity by electrical resistivity, magnetization, AC susceptibility and specific heat measurements. The results have been analyzed and the relations between the sample quality, ...