Evidence for spin mixing in holmium thin film and crystal samples
Evidence for spin mixing in holmium thin film and crystal samples
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DOI：
10.1103/physrevb.83.144518
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
I. T. Usman;K. Yates;J. Moore;K. Morrison;V. Pecharsky;K. Gschneidner;T. Verhagen;J. Aarts;V. Zverev;J. Robinson;J. Witt;M. Blamire;L. Cohen
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文献类型：
--
作者：
I. T. Usman;K. Yates;J. Moore;K. Morrison;V. Pecharsky;K. Gschneidner;T. Verhagen;J. Aarts;V. Zverev;J. Robinson;J. Witt;M. Blamire;L. Cohen
在最近的一些实验中，钬被证明在接近自旋单重态超导体时可以促进自旋三重态配对。支持自旋三重态配对的条件是铁磁体在与超导体的界面处具有不均匀的磁态。在这里，我们使用Andreev反射光谱研究单一的铁磁体/超导体界面形成的钬和铌的性能，作为它们之间的连接的接触电阻的函数。我们发现，无论是单晶和$c$轴取向的薄膜钬显示出不寻常的行为，低结接触电阻，自旋混合型的特性，这被认为是必要的支撑自旋三重态形成。我们还探讨了当结由Ni_{0.19} Pd_{0.81}$和Nb形成时是否观察到这种特征。
In a number of recent experiments, holmium has been shown to promote spin-triplet pairing when in proximity to a spin-singlet superconductor. The condition for the support of spin-triplet pairing is that the ferromagnet should have an inhomogeneous magnetic state at the interface with the superconductor. Here we use Andreev reflection spectroscopy to study the properties of single ferromagnet/superconductor interfaces formed of holmium and niobium, as a function of the contact resistance of the junction between them. We find that both single-crystal and $c$-axis-oriented thin-film holmium show unusual behavior for low junction contact resistance, characteristic of spin-mixing-type properties, which are thought necessary to underpin spin-triplet formation. We also explore whether this signature is observed when the junction is formed of ${\mathrm{Ni}}_{0.19}{\mathrm{Pd}}_{0.81}$ and niobium.