反钙钛矿型砷化物SrPd $_{3}$ As中的隐相结构和超导相
Hidden Structural and Superconducting Phase Induced in Antiperovskite Arsenide SrPd$_{3}$As
摘要：
材料变异的丰富往往有助于材料科学的进步。首次发现了反钙钛矿型砷化物SrPdPDMATHABMM As，揭示了Sr（Pd $_{1-x}$ $_{x}$）$_{3}$ As中隐藏的结构和超导相。富Pd样品（0 $\leq$ × $\leq$ 0.2）具有相同的非中心对称（NCS）四联体结构（$I41md$的空间群）作为SrPd $_{3}$ P。发现出现了与SrPt $_{3}$ P相同的（$P4/nmm$），伴随着在高达3.7 K的转变温度（$T_\mathrm{c}$）下的超导性。在用富含Pt的标称组成（0.8 $\leq$ x $\leq$ 1.0）合成的样品中，结晶出具有共生结构（CS-斜方晶系与Cmcm）的Sr $_{2}$（Pd，Pt）$_{8-y}$ As $_{1+y}$。Sr（Pd，Pt）$_{3}$ As的相图与（Ca，Sr）PdPDMATHABMM P的相图相似，超导性（$T_\mathrm{c}$ $\geq$ 2 K）发生在由NCS相取代引起的CS相中.这项研究表明了进一步的材料变化扩展的潜力和元素替代的重要性，以揭示相关的反钙钛矿隐藏相。
英文摘要：
Enriching the material variation often contributes to the progress of materials science. We have discovered for the first time antiperovskite arsenide SrPd$_{3}$As and revealed a hidden structural and superconducting phase in Sr(Pd$_{1-x}$Pt$_{x}$)$_{3}$As. The Pd-rich samples (0 $\leq$ x $\leq$ 0.2) had the same non-centrosymmetric (NCS) tetragonal structure (a space group of $I41md$) as SrPd$_{3}$P. For the samples with 0.3 $\leq$ x $\leq$ 0.7, a centrosymmetric (CS) tetragonal structure ($P4/nmm$) identical to that of SrPt$_{3}$P was found to appear, accompanied by superconductivity at a transition temperature ($T_\mathrm{c}$) up to 3.7 K. In the samples synthesized with Pt-rich nominal compositions (0.8 $\leq$ x $\leq$ 1.0), Sr$_{2}$(Pd,Pt)$_{8-y}$As$_{1+y}$ with an intergrowth structure (CS-orthorhombic with Cmcm) was crystallized. The phase diagram obtained for Sr(Pd,Pt)$_{3}$As was analogous to that of (Ca,Sr)Pd$_{3}$P in that superconductivity ($T_\mathrm{c}$ $\geq$ 2 K) occurred in the CS phases induced by substitutions to the NCS phases. This study indicates the potential for further material variation expansion and the importance of elemental substitutions to reveal hidden phases in related antiperovskites.
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