论文标题
在100 GPa以上的元素yttrium中正常bombic FDDD晶体结构的实验证据
Experimental evidence for orthorhombic Fddd crystal structure in elemental yttrium above 100 GPa
论文作者
论文摘要
我们提出了大量和薄膜样品上元素YTTrium的电阻测量，并且两者都表现出极高的压力。我们表明，超过100 GPA的超导转变温度的压力依赖性与Chen等人的预测FDDD相吻合。 [物理。莱特牧师。 109，157004（2012）]。这一结果与Samudrala等人的123 GPA上的X射线数据进行了新的Rietveld精炼。 [J。物理。冷凝物。 Matter 24，362201（2012）]提供了有力的证据，表明100 GPA以上的YTTrium的原子结构是正常的FDDD。此外，我们直接在钻石砧上蒸发Yttrium膜的过程预计将是未来合成新的Superydride超导体的宝贵资产。
We present electrical resistance measurements of elemental yttrium on bulk and film samples, and both exhibit superconductivity at very high pressures. We show that the pressure dependence of the superconducting transition temperature above 100 GPa is in good agreement with the predicted Fddd phase by Chen et al. [Phys. Rev. lett. 109, 157004 (2012)]. This result together with a new Rietveld refinement made on X-ray data at 123 GPa from Samudrala et al. [J. Phys. Condens. Matter 24, 362201 (2012)] offer strong evidence that the atomic structure of yttrium above 100 GPa is orthorhombic Fddd. Furthermore, our process of evaporating yttrium film directly on a diamond anvil is expected to be a valuable asset for future synthesis of new superhydride superconductors.
