LaRu3Si2 的两隙超导态

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2024-08-22 DOI:10.1016/j.physc.2024.1354583

T. Ushioda, T. Muranaka

引用次数: 0

摘要

我们合成了高质量的 LaRu3Si2（Tc= 7.5 K）多晶样品，并报告了超导间隙各向异性与 μ0Hc2 和 Cel/γTc 在 Tc 以下的温度相关性。μ0Hc2在接近低温区（T≤0.25Tc）之前与T线性相关，这种行为可能与WHH理论不一致。根据 T 线性拟合，μ0Hc2(0) 估计为 10.2 T。我们认为，虽然在 3 K ≤T≤Tc 时会出现较大的间隙（2Δ1/kB Tc=3.63），但在 T≤3 K 时的低洼准粒子激发是由较小的间隙（2Δ2/kB Tc=2.62）主导的。我们的实验结果表明，LaRu3Si2 的双间隙超导态是可行的。

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Two-gap superconducting states of LaRu3Si2

We synthesize high-quality LaRu $_{3}$ Si $_{2}$ ( $T_{c}$ = 7.5 K) polycrystalline sample and report the superconducting gap anisotropy relative to the temperature dependence of $μ_{0} H_{c 2}$ and $C_{e l}$ / $γ T_{c}$ below $T_{c}$ . The $μ_{0} H_{c 2}$ satisfies $T$ -linear dependence until it approaches a low temperature region ( $T \leq 0.25 T_{c}$ ), and this behavior may not agree with the WHH theory. Based on $T$ -linear fitting, the $μ_{0} H_{c 2}$ (0) is estimated to be 10.2 T. The $C_{e l}$ / $γ T_{c}$ below $T_{c}$ cannot be expressed by a simple exponential fit. It is considered that although a larger gap (2 $Δ_{1}$ / $k_{B}$ $T_{c}$ =3.63) opens at 3 K $\leq T \leq T_{c}$ , low-lying quasiparticle excitations at $T \leq$ 3 K are dominated by a smaller gap (2 $Δ_{2}$ / $k_{B}$ $T_{c}$ =2.62). Our experimental results indicate the feasibility of a two-gap superconducting state of LaRu $_{3}$ Si $_{2}$ .

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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.