Materials Today最新文献

Inverse temperature-dependent toughness and exceptional cryogenic damage tolerance in a plain bcc steel 在普通bcc钢的逆温度依赖韧性和特殊的低温损伤容忍度

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-11 DOI: 10.1016/j.mattod.2026.103279

Xiaoning Xu , Punit Kumar , David H. Cook , Qibin Ye , Binxing Wang , Yuexin Chu , Yong Tian , Yi Li , Robert O. Ritchie

Steels with the body-centered cubic (bcc) structure suffer low-temperature brittleness due to an inherent ductile-to-brittle transition that inhibits plastic deformation. Strategies to improve the cryogenic toughness generally involve stabilizing a face-centered cubic (fcc) phase to prevent this transition; however, this involves alloying with high concentrations of nickel, cobalt, and chromium, which are expensive and unsustainable due to their high environmental impact, energy-intensive extraction processes, and limited global reserves. Here, we engineered a low-carbon, micro-alloyed steel to possess a dual-phase, ultrafine-grained ferrite/martensite lamellar microstructure. This structure confers an unusual inverse-temperature dependence of impact toughness across a broad temperature range (383 K to 77 K) and exceptional resistance to fracture under both impact and quasi-static loading conditions at cryogenic temperatures (77 K). These properties are achieved through a combination of extrinsic toughening from delamination and crack bridging, as well as intrinsic toughening by interface dislocation-mediated plastic deformation within ferrite and activation of multiscale substructure sliding in martensite. This microstructural design strategy offers a pathway to engineer plain bcc steels with exceptional cryogenic damage tolerance without the addition of expensive and critical elements.

具有体心立方（bcc）结构的钢由于固有的延脆转变抑制了塑性变形而遭受低温脆性。提高低温韧性的策略通常包括稳定面心立方相（fcc）以防止这种转变；然而，这涉及到使用高浓度的镍、钴和铬合金，由于它们对环境的高影响、能源密集型的提取过程和有限的全球储量，这些合金价格昂贵且不可持续。在这里，我们设计了一种低碳、微合金钢，使其具有双相、超细晶铁素体/马氏体片层组织。这种结构在很宽的温度范围内（383 K至77 K）具有不同寻常的反温度依赖性，并且在低温（77 K）的冲击和准静态加载条件下具有优异的抗断裂性。这些性能是通过脱层和裂纹桥接的外在增韧，以及铁素体内部界面位错介导的塑性变形和马氏体中多尺度亚结构滑动激活的内在增韧来实现的。这种微观结构设计策略为设计具有特殊低温损伤容忍度的普通bcc钢提供了一条途径，而无需添加昂贵和关键的元素。

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引用次数: 0

Deformation behaviors of dislocation cellular structures in alloys produced by additive manufacturing 增材制造合金中位错胞状结构的变形行为

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-04 DOI: 10.1016/j.mattod.2026.103268

Jinqiao Liu , Hao Wang , Ranming Niu , Chuanxi Ren , Kevin Sisco , Ying Liu , Zibin Chen , Julie Cairney , Yiu-Wing Mai , Simon Ringer , Xiaozhou Liao

The dislocation cellular structure is a typical microstructural feature in additively manufactured alloys. A persistent debate surrounds how dislocation cellular structures strengthen materials. This study, utilizing in-situ tensile straining transmission electron microscopy, unveils the presence of two distinct types of cell walls, differentiated by the presence or absence of discernible crystallographic misorientations across the cell walls. Cell walls with misorientations act as dislocation sinks and absorb dislocations, whereas cell walls without misorientation hamper dislocation motion by forest dislocation entanglement. These contrasting cell wall–dislocation interaction mechanisms lead to different structural stabilities of cell walls. Cell walls with misorientations tend to maintain their structural integrity during deformation, while cell walls without misorientation are prone to dissolution under high strain. These deformation behaviors suggest that the dislocation cellular structure enforces both dislocation hardening and boundary hardening mechanisms, contingent on the type of dislocation cell walls. This study further demonstrates that by varying additive manufacturing parameters, the fractions of different types of cell walls can be adjusted, thereby enhancing the overall mechanical properties.

位错胞状组织是增材制造合金中典型的显微组织特征。关于位错细胞结构如何强化材料的争论一直存在。本研究利用原位拉伸应变透射电子显微镜，揭示了两种不同类型细胞壁的存在，通过细胞壁上存在或不存在可识别的晶体取向偏差来区分。有错取向的细胞壁作为位错的汇并吸收位错，而没有错取向的细胞壁通过森林位错纠缠阻碍位错的运动。这些不同的细胞壁-位错相互作用机制导致了不同的细胞壁结构稳定性。取向错误的细胞壁在变形过程中倾向于保持其结构的完整性，而没有取向错误的细胞壁在高应变下容易溶解。这些变形行为表明，位错胞结构强化了位错硬化和边界硬化机制，这取决于位错细胞壁的类型。本研究进一步证明，通过改变增材制造参数，可以调整不同类型细胞壁的组分，从而提高整体力学性能。

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引用次数: 0

3-D printed ultrastrong heat-resistant aluminum alloy achieved by bioinspired nanoscale amorphous confinement 生物启发纳米级非晶约束实现的3d打印超强耐热铝合金

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-04 DOI: 10.1016/j.mattod.2026.103267

Mingxi Li , Maowen Liu , Guodong Li , Zengqian Liu , Fei Fang , Chaoli Ma , Zhefeng Zhang , Robert O. Ritchie , Ruixiao Zheng

The high-temperature applications of aluminum alloys are constrained by their poor thermal stability, high creep susceptibility, and limited strength at elevated temperatures. Traditional dispersion strengthening has encountered inherent limitations in overcoming these challenges. Here, we introduce a bioinspired nanoscale confinement strategy realized by engineering a continuous three-dimensional crystalline-amorphous interpenetrating network structure, reminiscent of those found in natural biological materials. This strategy is implemented in an additively manufactured aluminum alloy, providing stringent spatial confinement that effectively impedes dislocation motion, grain-boundary migration, and atomic diffusion. In addition to good printability, the as-printed alloy achieves ultrahigh strength at room temperature to elevated temperatures, superior creep resistance, and outstanding thermal stability – a synergistic combination of properties that markedly outperforms previously reported materials. This work demonstrates the concept of strengthening materials by utilizing a continuous nanoscale amorphous network, rather than dispersed particles, through harnessing the nanoscale confinement effect inspired by Nature.

铝合金的高温应用受到其热稳定性差、高蠕变敏感性和高温强度有限的限制。传统的分散加强在克服这些挑战时遇到了固有的限制。在这里，我们介绍了一种生物启发的纳米级约束策略，通过工程设计一个连续的三维晶体-非晶互穿网络结构来实现，让人想起天然生物材料中的结构。该策略在增材制造的铝合金中实现，提供严格的空间限制，有效地阻碍位错运动，晶界迁移和原子扩散。除了良好的可打印性外，打印合金在室温到高温下都具有超高强度，具有优异的抗蠕变性能和出色的热稳定性，这些性能的协同组合明显优于先前报道的材料。这项工作展示了通过利用受大自然启发的纳米级约束效应，利用连续的纳米级非晶网络而不是分散的颗粒来增强材料的概念。

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引用次数: 0

Ultrafine CoCrCuFeNi high entropy alloy thin films with high strength, plastic deformability and thermal stability achieved via grain engineering and nanoclustering 通过晶粒工程和纳米聚类技术，获得了具有高强度、塑性变形和热稳定性的超细CoCrCuFeNi高熵合金薄膜

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-11 DOI: 10.1016/j.mattod.2026.103280

Davide Vacirca , Francesco Bignoli , Andrea Li Bassi , Yuting Dai , Ali Ahmadian , Gregory Abadias , Philippe Djemia , Gerhard Dehm , James P. Best , Matteo Ghidelli

The design of high-performance structural materials is always pursuing the combination of mutually exclusive properties such as mechanical strength, plasticity and thermal stability. Although high entropy alloys thin films (HEAs-TF) show promising mechanical and thermal properties, the development of novel nanostructures with unique nanoscale features is needed to overcome the strength-plasticity-thermal stability trade-off, going beyond a conventional compositional control. Here, we present a new synthesis route to fabricate ultra-strong, highly plastic, and thermally stable HEAs-TF leveraging the unique capabilities of pulsed laser deposition (PLD). We demonstrate our approach by focusing on CoCrCuFeNi, a model FCC HEA of the original Cantor family. Specifically, we synthetize ultrafine grain structures with controllable size (down to 12 nm) which can be further tailored by post-thermal annealing treatments, resulting in high hardness (11 GPa) and yield strength (2.0 GPa) due to Hall-Petch strengthening, outperforming similar HEAs-TF while maintaining high plasticity (no fracture at 30% strain). Moreover, these ultrafine HEAs-TF shows enhanced thermal stability, grain growth starting at T = 49% of T_m (melting temperature), while maintaining high hardness (9.1 GPa) after annealing for 1 h at 460°C. The PLD-deposited ultrafine HEAs-TF lead to mutual thermodynamic and mechanical stabilization, opening up a new approach for stable, strong and ductile materials.

高性能结构材料的设计始终追求机械强度、塑性和热稳定性等互斥性能的组合。虽然高熵合金薄膜（HEAs-TF）具有良好的机械和热性能，但需要开发具有独特纳米尺度特征的新型纳米结构来克服强度-塑性-热稳定性之间的权衡，而不仅仅是传统的成分控制。在这里，我们提出了一种新的合成路线，利用脉冲激光沉积（PLD）的独特能力来制造超强，高塑性和热稳定的HEAs-TF。我们通过关注CoCrCuFeNi来展示我们的方法，CoCrCuFeNi是原始康托家族的FCC HEA模型。具体而言，我们合成了可控制尺寸（低至12 nm）的超细晶粒结构，可以通过热后退火处理进一步定制，从而获得高硬度（11 GPa）和屈服强度（2.0 GPa），由于Hall-Petch强化，优于类似的HEAs-TF，同时保持高塑性（在30%应变下不断裂）。此外，这些超细HEAs-TF表现出增强的热稳定性，晶粒生长开始于T = 49%的Tm（熔化温度），在460℃下退火1 h后仍保持较高的硬度（9.1 GPa）。pld沉积的超细HEAs-TF导致了相互的热力学和机械稳定，为稳定，强和延展性材料开辟了新的途径。

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引用次数: 0

Precision uterine mRNA therapy to Restore implantation and fertility 精确子宫mRNA治疗恢复着床和生育能力

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-05 DOI: 10.1016/j.mattod.2026.103270

Jun Liao , Zhiqiang Lin , Chuang Liu

Endometrial dysfunction is a major cause of implantation failure, yet protein-based local therapies are limited by rapid clearance and systemic exposure. A recent study exploits the window of implantation (WOI) to enable integrin-targeted messenger RNA (mRNA) delivery, turning the endometrium into a transient source of therapeutic proteins.

子宫内膜功能障碍是植入失败的主要原因，但基于蛋白质的局部治疗受到快速清除和全身暴露的限制。最近的一项研究利用植入窗口（WOI）实现整合素靶向信使RNA （mRNA）的递送，将子宫内膜转变为治疗蛋白的短暂来源。

引用次数: 0

Strain-tolerant design of LiFexMn1-xPO4 cathodes: mechanistic insights and practical strategies toward high-performance phosphate batteries LiFexMn1-xPO4阴极的耐应变设计：高性能磷酸盐电池的机理见解和实用策略

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-08 DOI: 10.1016/j.mattod.2026.103205

Yadong Yang , Wanwei Zhao , Guangyao Jin , Ye Hong , Rui Xu

LiFe_xMn₁_-xPO₄ (LFMP) has emerged as a next-generation cathode material that bridges the cost-effectiveness, safety, and sustainability of LiFePO₄ (LFP) with the higher energy density of nickel-rich layered oxides without reliance on cobalt or nickel. However, the commercialization of LFMP is hindered by its intrinsically low electronic conductivity, one-dimensional tortuous Li⁺ diffusion channels, and Mn-induced Jahn-Teller distortions. These factors, compounded by lattice strain during Fe²⁺/Fe³⁺ and Mn²⁺/Mn³⁺ redox transitions, lead to anisotropic stress, Li⁺ transport barriers, increased internal resistance, and rapid capacity fade. This review systematically examines the structural and electrochemical behavior of LFMP across compositions, morphologies, and doping strategies. We analyze operando phase evolution, defect chemistry, and Li⁺ migration pathways to elucidate the mechanistic origin of electrochemical fading. Particular emphasis is placed on solid solution stabilization, anti-site defect engineering, and elastic strain modulation via ion substitution and particle miniaturization. We synthesize insights across compositional design (multi-metal doping, Fe/Mn ordering), crystallographic defect control (e.g., anti-site Li⁺/M²⁺ engineering), and morphological strategies (strain-accommodated nanoarchitectures), outlining approaches to extend solid-solution regimes and mitigate mechanical degradation. By bridging mechanistic understanding with scalable synthesis techniques, this review proposes a roadmap for the commercialization of LFMP as a strain-resilient, high-voltage cathode suitable for terawatt-scale energy storage.

LiFexMn1-xPO4 （LFMP）已成为下一代正极材料，它将LiFePO4 （LFP）的成本效益、安全性和可持续性与高能量密度的富镍层状氧化物相结合，而不依赖于钴或镍。然而，LFMP的商业化受到其固有的低电子导电性，一维弯曲的Li+扩散通道和mn诱导的Jahn-Teller畸变的阻碍。这些因素加上Fe2+/Fe3+和Mn2+/Mn3+氧化还原转变过程中的晶格应变，导致各向异性应力、Li+输运障碍、内阻增加和容量快速衰减。本文系统地研究了LFMP的结构和电化学行为，包括成分、形态和掺杂策略。我们分析了operando相演化、缺陷化学和Li+迁移途径，以阐明电化学褪色的机理起源。特别强调的是固溶体稳定，反位缺陷工程，以及通过离子取代和粒子小型化的弹性应变调制。我们综合了组成设计（多金属掺杂，Fe/Mn有序），晶体缺陷控制（例如，反位Li+/M2+工程）和形态策略（应变调节纳米结构）的见解，概述了扩展固溶体系和减轻机械降解的方法。通过将机理理解与可扩展的合成技术相结合，本文提出了LFMP作为应变弹性、适合太瓦级储能的高压阴极的商业化路线图。

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引用次数: 0

Grain boundary topology engineering enables crack-free additive manufacturing of tungsten 晶界拓扑工程实现了钨的无裂纹增材制造

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-10 DOI: 10.1016/j.mattod.2026.103271

Mingshen Li , Renguang Liu , Andrew Godfrey , Yiming Niu , Shuyan Zhong , Menghan Ma , Yubin Lan , Jinhan Chen , Kailun Li , Wenjing Zhang , Wei Liu , Xiaoxu Huang , Huajian Gao

Additive manufacturing (AM) of tungsten is severely limited by intergranular cracking, rooted in its intrinsic brittleness and coarse solidification microstructure. Here we demonstrate that grain-boundary topology engineering, enabled by multi-cycle local rescanning in laser powder bed fusion (LPBF), produces crack-free, high-performance bulk tungsten without extreme preheating or alloying. Controlled thermomechanical cycling introduces well-recovered low-angle dislocation boundaries that progressively reconstruct straight solidification grain boundaries into a tortuous network rich in large-dihedral-angle triple junctions. Experiments and finite-element modeling reveal that this reconstruction is driven by cyclic high-temperature plasticity beneath the melt pool. Large-scale molecular dynamics simulations show that these large-angle triple junctions act as potent crack arrestors, promoting crack-tip blunting and dislocation-mediated plasticity. The resulting tungsten exhibits full density, complete crack suppression, and mechanical properties comparable to wrought material. Our results establish grain-boundary topology engineering as a general design principle for introducing toughness into brittle crystalline materials through deliberate control of boundary network geometry.

钨的增材制造受到晶间裂纹的严重限制，其根源在于其固有的脆性和粗糙的凝固组织。在这里，我们证明了在激光粉末床熔合（LPBF）中通过多周期局部重扫描实现的晶界拓扑工程，可以在没有极端预热或合金化的情况下产生无裂纹的高性能体钨。受控的热机械循环引入了恢复良好的低角度位错边界，逐渐将直凝固晶界重建为一个富含大二面角三重结的扭曲网络。实验和有限元模拟表明，这种重构是由熔池下的循环高温塑性驱动的。大规模分子动力学模拟表明，这些大角度三联结作为有效的裂纹阻滞剂，促进裂纹尖端钝化和位错介导的塑性。由此产生的钨具有充分的密度，完全抑制裂纹，以及与锻造材料相当的机械性能。我们的研究结果确立了晶界拓扑工程作为一种通用设计原则，通过有意控制边界网络几何形状，将韧性引入脆性晶体材料。

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引用次数: 0

Toxicity and biosafety optimizing in perovskite nanomaterials 钙钛矿纳米材料的毒性和生物安全性优化

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-04 DOI: 10.1016/j.mattod.2026.103264

Yupeng Zhang , Shuang Zhu , Yutong Jin , Haiwei Xu , Zhanjun Gu , Xuesong Feng

Perovskite nanomaterials demonstrate good optoelectronic properties with broad applications in photovoltaics, light emitting diode, and biomedicine. However, their potential biological toxicity poses significant challenges for safe use. This review systematically examines toxicity mechanisms primarily driven by lead ion release, which induces oxidative stress, DNA damage, and organ-specific pathological changes across respiratory, cardiovascular, hepatic, renal, gastrointestinal, and neural systems. Additionally, the toxicity of lead-free alternatives and organic cations is discussed. We highlight material engineering strategies such as surface modification, encapsulation, and elemental substitution to mitigate biosafety risks. Furthermore, regulatory frameworks and risk assessment methods are outlined to guide safe deployment. This work aims to bridge the gap between high performance and biosafety, providing critical insights for developing biocompatible perovskite-based technologies.

钙钛矿纳米材料具有良好的光电性能，在光伏、发光二极管、生物医学等领域有着广泛的应用。然而，它们潜在的生物毒性对安全使用构成了重大挑战。这篇综述系统地研究了主要由铅离子释放驱动的毒性机制，铅离子释放诱导氧化应激、DNA损伤和呼吸、心血管、肝脏、肾脏、胃肠道和神经系统的器官特异性病理改变。此外，还讨论了无铅替代品和有机阳离子的毒性。我们强调材料工程策略，如表面改性，封装和元素替代，以减轻生物安全风险。此外，还概述了监管框架和风险评估方法，以指导安全部署。这项工作旨在弥合高性能和生物安全之间的差距，为开发生物相容性钙钛矿技术提供关键见解。

引用次数: 0

Imidazolium lipid-based nanoparticles enable effective mRNA delivery and cellular immune response 咪唑类脂质纳米颗粒能够有效的mRNA传递和细胞免疫反应

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-05 DOI: 10.1016/j.mattod.2026.103265

Jinghan Lin , Yining Zhu , Leonardo Cheng , Christine Wei , Jiayuan Kong , Joseph Choy , Xiaoya Lu , Di Yu , Jingyao Ma , Xiang Liu , Yunhe Su , Sareena Naganand , Claire Gueguen , Quentin Huaulme , Pauline Urquia , Hai-Quan Mao

Imidazolium LipidBrick® cationic lipid nanoparticles (LNPs) provide a pH-independent alternative to conventional ionizable systems for nucleic acid delivery. Through a high-throughput screen of 1,944 formulations spanning eight imidazolium cores, three helper lipids, and varying PEG densities, we found that more than half of the library outperformed the clinical ionizable benchmark ALC-0315 in multiple representative mammalian cell types. Top-performing candidates showed robust cellular uptake, efficient endosomal escape, and strong transgene expression both in vitro and following intramuscular administration. A lead formulation (C3 LNP), incorporating an imidazolium lipid core bearing a hydroxyethyl substituent, with 30 mol% DOPE, achieved comparable intramuscular luciferase expression and antibody titers to ALC-0315, while eliciting ∼ 3-fold stronger ovalbumin-specific IFN-γ⁺ T-cell responses and maintaining low cytotoxicity. Machine-learning analysis of the dataset further distilled transferable design rules to inform future formulation strategies. Collectively, these findings establish cationic LipidBrick® LNPs as a versatile platform for mRNA delivery, offering a generalizable framework for the high-throughput discovery of ionization-independent systems that effectively prime adaptive immune responses.

咪唑LipidBrick®阳离子脂质纳米颗粒（LNPs）提供了一种不依赖ph值的替代方案，可用于核酸递送的传统电离系统。通过对1,944种配方的高通量筛选，包括八种咪唑核心，三种辅助脂质和不同的PEG密度，我们发现超过一半的库在多种代表性哺乳动物细胞类型中优于临床电离基准ALC-0315。表现最好的候选药物在体外和肌内给药后都表现出强大的细胞摄取，有效的内体逃逸和强大的转基因表达。一种先导配方（C3 LNP），包含含有羟乙基取代基的咪唑脂质核心，含有30 mol%的DOPE，实现了与ALC-0315相当的肌内荧光素酶表达和抗体滴度，同时引发约3倍强的卵清蛋白特异性IFN-γ+ t细胞反应并保持低细胞毒性。对数据集的机器学习分析进一步提炼出可转移的设计规则，为未来的制定策略提供信息。总的来说，这些发现建立了阳离子LipidBrick®LNPs作为mRNA传递的通用平台，为高通量发现有效启动适应性免疫应答的非电离系统提供了一个可推广的框架。

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引用次数: 0

Pauli-limited upper critical field and anisotropic depairing effect of La2.82Sr0.18Ni2O7 superconducting thin film La2.82Sr0.18Ni2O7超导薄膜的保利极限上临界场及各向异性依赖效应

IF 22 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today

Pub Date : 2026-06-01 Epub Date: 2026-03-06 DOI: 10.1016/j.mattod.2026.103269

Ke Wang , Maosen Wang , Wei Wei , Bo Hao , Mengqin Liu , Qiaochao Xiang , Xin Zhou , Qiang Hou , Yue Sun , Zengwei Zhu , Sheng Li , Yuefeng Nie , Zhixiang Shi

We investigate the upper critical field and superconducting anisotropy of epitaxial La_2.82Sr_0.18Ni₂O₇ thin films, which show a sharp superconducting transition at

T_{c} = 31.6 K

. Near

T_{c}

, superconductivity exhibits thickness-limited two-dimensional characteristics. Upon cooling, the out-of-plane coherence length

ξ_{c}

decreases below the sample thickness of ∼ 6 nm, corresponding to a 3-unit-cell film, indicating a crossover to intrinsic three-dimensional bulk superconductivity. High-field transport measurements reveal large upper critical fields with a small anisotropy ratio

{γ = H}_{c 2}^{ab}

/

H_{c 2}^{c}

\approx 1.34

, comparable to bulk Ruddlesden-Popper nickelates. At low temperatures, the in-plane (ab) upper critical field

H_{c 2}^{ab}

is strongly suppressed by spin-paramagnetic pair breaking and approaches the Pauli limit (

H_{c_{2}}^{P a u l i} = 58 T

), while

H_{c 2}^{c}

remains largely unaffected. This anisotropic Pauli limitation accounts for the reduced upper critical field anisotropy and supports the conclusion that superconductivity in these films is fundamentally three-dimensional bulk like. Our results highlight the essential role of spin-paramagnetic effects in shaping the high-field superconducting phase diagram of Ruddlesden-Popper nickelates.

我们研究了La2.82Sr0.18Ni2O7外延薄膜的上临界场和超导各向异性，发现在Tc=31.6K时出现了明显的超导转变。在Tc附近，超导表现出厚度受限的二维特征。冷却后，面外相干长度ξc减小到样品厚度~ 6 nm以下，对应于3单元电池薄膜，表明向本征三维体超导性的交叉。高场输运测量显示，其上临界场较大，各向异性比较小，γ=Hc2ab/Hc2c≈1.34，与Ruddlesden-Popper镍酸盐相当。在低温下，平面内（ab）上临界场Hc2ab受到自旋顺磁对断裂的强烈抑制，接近泡利极限（Hc2Pauli=58T），而Hc2c基本不受影响。这种各向异性泡利限制解释了上临界场各向异性的降低，并支持了这些薄膜中的超导性基本上是三维体状的结论。我们的研究结果强调了自旋顺磁效应在形成Ruddlesden-Popper镍酸盐的高场超导相图中的重要作用。

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引用次数: 0