高熵合金（TaNb）$_{1-x}$（ZrHfTi）$_x$超导薄膜的制备与表征
Preparation and Characterization of High-Entropy Alloy (TaNb)$_{1-x}$(ZrHfTi)$_x$ Superconducting Films
摘要：
本文报道了（TaNb）_1-x（ZrHfTi）_x高熵合金超导薄膜的制备和物理性质。薄膜采用磁控溅射法在室温下制备，x = 0 ~ 1，平均厚度为600 ~ 950 nm。所有的薄膜结晶在一个伪体心立方（BCC）结构。对于x < 0.65的样品，正常状态下的性质是金属性的，而对于x > 0.65的薄膜是弱绝缘的。从金属到弱绝缘的转变发生在接近等摩尔化学计量。我们发现所有的薄膜，除了x = 0或1，成为超导在低温下，我们解释其超导性质的巴丁库珀施里弗（BCS）框架内。当x = 0.43时，固溶体的最高转变温度Tc = 6.9K。在近等摩尔比x = 0.65时，最大上临界场B_c2（0）= 11.05T，此时混合熵最大。所有的膜从运输测量导出的超导参数被发现是接近那些报道的非晶超导体。我们的研究结果表明，这些薄膜的高熵合金是有前途的候选人超导器件的制造。
英文摘要：
We report on the preparation and the physical properties of superconducting (TaNb)_1-x(ZrHfTi)_x high-entropy alloy films. The films were prepared by means of magnetron sputtering at room temperature, with x ranging from 0 to 1 with an average thickness of 600 - 950 nm. All films crystallize in a pseudo body-centered cubic (BCC) structure. For samples with x < 0.65, the normal-state properties are metallic, while for x > 0.65 the films are weakly insulating. The transition from metallic to weakly insulating occurs right at the near-equimolar stoichiometry. We find all films, except for x = 0 or 1, to become superconducting at low temperatures, and we interpret their superconducting properties within the Bardeen-Cooper-Schrieffer (BCS) framework. The highest transition temperature T_c = 6.9 K of the solid solution is observed for x = 0.43. The highest upper-critical field B_c2(0) = 11.05 T is found for the near-equimolar ratio x = 0.65, where the mixing entropy is the largest. The superconducting parameters derived for all the films from transport measurements are found to be close to those that are reported for amorphous superconductors. Our results indicate that these films of high-entropy alloys are promising candidates for superconducting device fabrication.
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