Weakly coupled Type-II superconductivity in a breathing Kagome metal ZrRe2

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED Physica C-superconductivity and Its Applications Pub Date : 2024-10-15 DOI:10.1016/j.physc.2024.1354604

Yingpeng Yu , Zhaolong Liu , Qi Li , Zhaoxu Chen , Yulong Wang , Munan Hao , Yaling Yang , Xuhui Wang , Chunsheng Gong , Long Chen , Zhenkai Xie , Kaiyao Zhou , Huifen Ren , Xu Chen , Shifeng Jin

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Abstract

We present a comprehensive investigation of the superconducting properties of ZrRe₂, a Re-based hexagonal Laves compounds. ZrRe₂ crystallizes in a C14-type structure (space group P6₃/mmc), where the Re atoms form a breathing Kagome lattice, with cell parameters a = b = 5.2682(5) Å and c = 8.63045 Å. Through transport measurements, the superconducting transition is observed with

T_{c}^{o n s e t}

= 6.44 K and

T_{c}^{z e r o}

= 6.06 K. In magnetization measurements(ZFC-FC) superconducting transition occurs at 6.12 K. The measured lower and upper critical fields are 6.27 mT and 7.84 T, respectively. Measurements of the specific heat capacity confirm the presence of bulk superconductivity, with a normalized specific heat change of

Δ C_{e} / γ T_{c} = 1.63

and an electron-phonon strength of

λ_{e p} = 0.69

. DFT calculations revealed that the band structure of ZrRe₂ is intricate and without van Hove singularity.

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呼吸卡戈米金属 ZrRe2 中的弱耦合 II 型超导性

我们展示了对 ZrRe2 超导特性的全面研究，ZrRe2 是一种 Re 基六方拉维斯化合物。ZrRe2 以 C14 型结构（空间群 P63/mmc）结晶，其中 Re 原子形成一个呼吸式 Kagome 晶格，晶胞参数为 a = b = 5.2682(5) Å 和 c = 8.63045 Å。在磁化测量（ZFC-FC）中，超导转变发生在 6.12 K。测得的下临界磁场和上临界磁场分别为 6.27 mT 和 7.84 T。比热容的测量结果证实了体超导的存在，归一化比热变化为 ΔCe/γTc=1.63，电子-声子强度为 λep=0.69。DFT 计算显示，ZrRe2 的能带结构错综复杂，没有范霍夫奇异性。

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来源期刊

Physica C-superconductivity and Its Applications 物理-物理：应用

CiteScore

2.70

自引率

11.80%

发文量

102

审稿时长

66 days

期刊介绍： Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.