From Weak- to Strong-Coupling Superconductivity in the AlB2-Type Solid Solution SrGa1-xAlxGe with Honeycomb Layers.

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
Dorota I Iwona Walicka, Olivier Blacque, Tomasz Klimczuk, Fabian Von Rohr
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Abstract

We report on the structure and the superconducting properties of 9-electron 111 compounds with honeycomb layers, namely SrGaGe, SrAlGe, and the SrGa1-x AlxGe solid solution. By means of single-crystal X-ray diffraction we show that, on one hand, SrGaGe crystallizes into the centrosymmetric P6/mmm space group (a = 4.2555(2) ˚A, c = 4.7288(2) ˚A) with statistical disorder in the [GaGe]2- 6 honeycomb layers. On the other hand, we confirm that SrAlGe crystallizes in a non-centrosymmetric space group, namely P6m2 (a = 4.2942(1) ˚A, c = 4.7200(2) ˚A) with fully ordered [AlGe]2- 6 honeycomb layers. By using magnetization and specific heat measurements, we show that the superconducting properties of SrGaGe and SrAlGe differ significantly from each other. SrGaGe is a superconductor with a critical temperature of Tc = 2.6 K falling into the weak coupling limit, while SrAlGe has a Tc = 6.7 K and can be classified in the strong coupling limit. By realizing the SrGa1-x AlxGe solid solution, we were able to investigate the transition between the different crystal structures as well as the evolution of the electronic properties. We show that the transition from the weak to the strong coupling superconductivity in this system is likely associated with the disorder-to-order transition of the honeycomb layer, along with the loss of the inversion center in the crystal structure.

具有蜂巢层的 AlB2 型固溶体 SrGa1-xAlxGe 中从弱耦合到强耦合的超导性。
我们报告了具有蜂窝层的 9 电子 111 化合物(即 SrGaGe、SrAlGe 和 SrGa1-x AlxGe 固溶体)的结构和超导特性。通过单晶 X 射线衍射,我们发现一方面,SrGaGe 结晶为中心对称 P6/mmm 空间群(a = 4.2555(2) ˚A,c = 4.7288(2) ˚A),[GaGe]2- 6 蜂窝层中存在统计无序。另一方面,我们证实 SrAlGe 在非中心对称空间群(即 P6m2(a = 4.2942(1) ˚A,c = 4.7200(2) ˚A))中结晶,[AlGe]2- 6 蜂窝层完全有序。通过磁化和比热测量,我们发现 SrGaGe 和 SrAlGe 的超导特性存在显著差异。SrGaGe 是一种临界温度为 Tc = 2.6 K 的超导体,属于弱耦合极限,而 SrAlGe 的临界温度为 Tc = 6.7 K,可归入强耦合极限。通过实现 SrGa1-x AlxGe 固溶体,我们得以研究不同晶体结构之间的转变以及电子特性的演变。我们的研究表明,该体系从弱耦合超导到强耦合超导的转变可能与蜂窝层的无序到有序转变以及晶体结构中反转中心的丧失有关。
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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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