Enhanced superconductivity in non-centrosymmetric hexagonal HfRuAs

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2025-04-02 DOI:10.1016/j.physc.2025.1354710

Lijia Zhou , Xin Chen , Guangtong Shan , Qiang Li , Xiaojun Kuang , Xianran Xing

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引用次数: 0

Abstract

We report the synthesis, crystal structure, superconductivity, and physical properties of HfRuAs, a ternary equiatomic compound that can crystallize in either the TiFeSi-type orthorhombic (o’-phase) or the Fe₂P-type hexagonal (h-phase) structure. Our synthesized polycrystalline samples exhibit coexistence of both two phases due to synthesis conditions. The h-phase demonstrates bulk type-II weak-coupling superconductivity with a superconducting transition temperature of approximately 7.25 K, and an upper critical field of 12.40 T. Structural refinements suggest that the expansion of Ru-Ru distances within triangular clusters may be associated with the enhancement of superconductivity in the h-phase. First-principles calculations confirm that antisymmetric spin-orbit coupling (ASOC) induces significant band splitting and opens a fully gapped superconducting state. These results indicate that h-phase HfRuAs is a promising candidate for exploring superconductivity in weakly correlated, non-centrosymmetric superconductors.

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非中心对称六方HfRuAs的超导性增强

我们报道了HfRuAs的合成，晶体结构，超导性和物理性质，HfRuAs是一种三元等原子化合物，可以结晶为tifesi型正交（o '相）或fe2o型六方（h相）结构。由于合成条件的原因，我们合成的多晶样品表现出两相共存。h相表现出整体ii型弱耦合超导性，超导转变温度约为7.25 K，最高临界场为12.40 t。结构的改进表明，三角形团簇内Ru-Ru距离的扩大可能与h相超导性的增强有关。第一性原理计算证实了反对称自旋轨道耦合（ASOC）引起了明显的能带分裂并打开了全间隙超导态。这些结果表明，h相HfRuAs是探索弱相关非中心对称超导体超导性的一个有希望的候选者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.