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Thermodynamic evidence for polaron stabilization inside the antiferromagnetic order of Eu5In2Sb6 极子在 Eu5In2Sb6 反铁磁阶内稳定的热力学证据
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-08 DOI: 10.1038/s43246-024-00689-9
Hubert Dawczak-Dębicki, M. Victoria Ale Crivillero, Matthew S. Cook, Sean M. Thomas, Priscila F. S. Rosa, Jens Müller, Ulrich K. Rößler, Pedro Schlottmann, Steffen Wirth
Materials exhibiting electronic inhomogeneities at the nanometer scale have enormous potential for applications. Magnetic polarons are one such type of inhomogeneity which link the electronic, magnetic and lattice degrees of freedom in correlated matter and often give rise to colossal magnetoresistance. Here, we investigate single crystals of Eu5In2Sb6 by thermal expansion and magnetostriction along different crystallographic directions. These data provide compelling evidence for the formation of magnetic polarons in Eu5In2Sb6 well above the magnetic ordering temperature. More specifically, our results are consistent with anisotropic polarons with varying extent along the different crystallographic directions. A crossover revealed within the magnetically ordered phase can be associated with a surprising stabilization of ferromagnetic polarons within the global antiferromagnetic order upon decreasing temperature. These findings make Eu5In2Sb6 a rare example of such coexisting and competing magnetic orders and, importantly, shed new light on colossal magnetoresistive behavior beyond manganites. Materials exhibiting electronic inhomogeneities at the nanometer scale, such as magnetic polarons, have great potential for magnetoresistive applications. Here, thermal expansion and magnetostriction measurements on Eu5In2Sb6 single crystals reveal the formation of magnetic polarons well above the magnetic ordering temperature, providing insights on colossal magnetoresistive behavior beyond manganites.
在纳米尺度上表现出电子不均匀性的材料具有巨大的应用潜力。磁极子就是这样一种不均匀性,它将相关物质中的电子自由度、磁性自由度和晶格自由度联系在一起,通常会产生巨大的磁阻。在这里,我们通过沿不同晶体学方向的热膨胀和磁致伸缩来研究 Eu5In2Sb6 单晶体。这些数据为远高于磁有序温度的 Eu5In2Sb6 中磁极子的形成提供了令人信服的证据。更具体地说,我们的结果与沿不同晶体学方向形成的程度各异的各向异性磁极子是一致的。在磁有序相中发现的交叉可能与温度降低时全球反铁磁有序中铁磁极子的惊人稳定有关。这些发现使 Eu5In2Sb6 成为这种磁有序共存和竞争的罕见实例,更重要的是,它为锰酸盐以外的巨磁阻行为提供了新的启示。在纳米尺度上表现出电子不均匀性(如磁极子)的材料具有磁阻应用的巨大潜力。在这里,对 Eu5In2Sb6 单晶体进行的热膨胀和磁致伸缩测量揭示了磁极子的形成远高于磁有序温度,为锰酸盐以外的巨大磁阻行为提供了启示。
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引用次数: 0
Bioengineering approach for the design of magnetic bacterial cellulose membranes 设计磁性细菌纤维素膜的生物工程方法
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-07 DOI: 10.1038/s43246-024-00562-9
Sundaravadanam Vishnu Vadanan, Rupali Reddy Pasula, Neel Joshi, Sierin Lim
Biopolymer research has led to the development of novel products through innovative strategies. Their functionalization is typically achieved by physical/chemical methods that require harsh chemicals or mechanical treatments. These functionalities could be alternatively achieved by employing bioengineering design methods. We demonstrate, a bioengineered dual-microbial approach to create functional bacterial cellulose from microbial workhorses. Komagataeibacter hansenii ATCC 53582 is used to produce bacterial cellulose and engineered E. coli is used to functionalize the matrix with a recombinant fibrous protein. The E. coli harbours synthetic genes for the secretion of amyloid curli protein subunit (CsgA) tagged with short functional M6A peptide domains. The incorporation of M6A-functionalized amyloid proteins into bacterial cellulose facilitates magnetite nanoparticle nucleation. We achieved a saturation magnetization of 40 emu g−1, a three-fold increase compared to existing strategies. The magnetic bacterial cellulose films demonstrate cytocompatibility and accelerate cell migration in the presence of magnetic field. Microbes have been shown to be effective for synthesizing functional materials. Here, bacterial cellulose is created via a dual microbial approach, with magnetite nanoparticles used to enhance magnetic behavior.
生物聚合物研究通过创新策略开发出了新型产品。它们的功能化通常是通过物理/化学方法实现的,需要苛刻的化学品或机械处理。而采用生物工程设计方法则可以实现这些功能。我们展示了一种生物工程双微生物方法,从微生物工作母机中创造出功能性细菌纤维素。Komagataeibacter hansenii ATCC 53582 用于生产细菌纤维素,工程大肠杆菌用于用重组纤维蛋白使基质功能化。大肠杆菌含有分泌淀粉样凝集蛋白亚基(CsgA)的合成基因,并标记有短的功能性 M6A 肽域。将 M6A 功能化淀粉样蛋白加入细菌纤维素可促进磁铁矿纳米粒子成核。我们的饱和磁化率达到了 40 emu g-1,比现有策略提高了三倍。磁性细菌纤维素薄膜具有细胞相容性,并能在磁场作用下加速细胞迁移。微生物已被证明能有效合成功能材料。在这里,细菌纤维素是通过双重微生物方法制成的,磁铁矿纳米粒子用于增强磁性。
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引用次数: 0
Unexpected band structure changes within the higher-temperature antiferromagnetic state of CeBi 铋铈高温反铁磁态的意外带状结构变化
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-07 DOI: 10.1038/s43246-024-00692-0
Yevhen Kushnirenko, Brinda Kuthanazhi, Benjamin Schrunk, Evan O’Leary, Andrew Eaton, Robert-Jan Slager, Junyeong Ahn, Lin-Lin Wang, Paul C. Canfield, Adam Kaminski
The interest in the rare-earth monopnictides was boosted after the discovery of unconventional surface-state pairs in antiferromagnetically ordered NdBi. In contrast to other materials in which such states were reported, CeBi is known to have multiple antiferromagnetic phases. In this study, we perform angle-resolved photoemission spectroscopy (ARPES) measurements in conjunction with density functional theory (DFT) calculations to investigate the evolution of the electronic structure of CeBi upon a series of antiferromagnetic (AFM) transitions. We find evidence for a new AFM transition in addition to two previously known from transport studies. We demonstrate the development of an additional Dirac state in the ( + − + − ) ordered phase and a transformation of unconventional surface-state pairs in the ( + + − − ) ordered phase. This revises the phase diagram of this intriguing material, where there are now three distinct AFM states below TN in zero magnetic field instead of two as it was previously thought. Rare-earth mono-pnictides antiferromagnets have generated recent interest as hosts to topological states and unconventional magnetic states. Here, angle-resolved photoemission spectroscopy reveals a hidden band-structure transition within the higher-temperature antiferromagnetic state of CeBi.
在反铁磁有序掺杂铋(NdBi)中发现非常规表面态对后,人们对稀土单锑化物的兴趣大增。与其他报道了此类状态的材料不同,已知 CeBi 具有多个反铁磁相。在本研究中,我们结合密度泛函理论(DFT)计算,进行了角度分辨光发射光谱(ARPES)测量,以研究一系列反铁磁(AFM)跃迁后硒化钴电子结构的演变。除了之前通过输运研究发现的两种反铁磁性转变外,我们还发现了一种新的反铁磁性转变的证据。我们证明了( + - + - )有序相中一个额外的狄拉克态的发展,以及( + + - - )有序相中非常规表面态对的转变。这修正了这种有趣材料的相图,在零磁场中,TN 以下有三种不同的 AFM 状态,而不是之前认为的两种。稀土单锑化物反铁磁体作为拓扑态和非常规磁态的宿主,最近引起了人们的兴趣。在这里,角度分辨光发射光谱揭示了 CeBi 高温反铁磁态中隐藏的带状结构转变。
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引用次数: 0
Mechanically rechargeable zinc-air batteries for two- and three-wheeler electric vehicles in emerging markets 用于新兴市场两轮和三轮电动车的锌空气机械充电电池
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-06 DOI: 10.1038/s43246-024-00662-6
Akhil Kongara, Arun Kumar Samuel, Gunjan Kapadia, Aravind Kumar Chandiran
Mechanically rechargeable zinc-air batteries are considered promising for powering electric vehicles due to their high theoretical energy density, but a few practical hurdles impede their implementation. Understanding the key technical blockades that restrict their implementation will enable quick deployment of these batteries in electric vehicles. This Review analyzes the performance of various on-road electric vehicle segments powered by lithium-ion batteries and compares this with the current rechargeable zinc-air battery development. We discuss the theoretical limits and vehicle-specific blockades involved in achieving the performance of mechanically rechargeable zinc-air battery-powered electric vehicles, equivalent to those powered by lithium-ion batteries. Based on the identified blockades, we present ideas on future research direction on positive and negative electrodes, and battery operation and architecture. Finally, we discuss the conditions under which these batteries can be implemented in various electric vehicle segments. Mechanically rechargeable zinc-air batteries are promising for powering electric vehicles but their implementation is restricted. This Review analyzes the performance of lithium-ion battery-powered electric vehicles and applies these thoughts to vehicles powered by rechargeable zinc-air batteries.
机械可充电锌空气电池因其理论能量密度高而被认为有望为电动汽车提供动力,但一些实际障碍阻碍了它们的应用。了解限制其应用的关键技术障碍,将有助于在电动汽车中快速部署这些电池。本综述分析了由锂离子电池驱动的各种公路电动汽车的性能,并将其与目前开发的可充电锌空气电池进行了比较。我们讨论了在实现机械可充电锌空气电池驱动电动汽车的性能(相当于锂离子电池驱动电动汽车的性能)方面存在的理论限制和特定车辆的障碍。根据所发现的障碍,我们就正极和负极以及电池操作和结构提出了未来的研究方向。最后,我们讨论了这些电池在不同电动汽车领域的应用条件。机械可充电锌空气电池有望为电动汽车提供动力,但其应用受到限制。本综述分析了以锂离子电池为动力的电动汽车的性能,并将这些想法应用于以可充电锌-空气电池为动力的汽车。
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引用次数: 0
Magnetic control of phonon transport in magnetic insulator thulium iron garnet 磁性绝缘体铥铁榴石中声子传输的磁控制
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-06 DOI: 10.1038/s43246-024-00682-2
Geun-Hee Lee, Phuoc Cao Van, Jong-Ryul Jeong, Se Kwon Kim, Kab-Jin Kim
The coupling between magnons and phonons and the associated phenomena have long been a focus of research in condensed matter physics. Contrary to its recognized role in magnon relaxation, its impact on phonon transport remains largely unexplored. Here, we fill this gap by investigating the effect of magnon-phonon coupling on phonon excitation, relaxation, and transport with magneto-optical reflectometry. Through simultaneous measurements of magnon and phonon populations in magnetic insulator thulium iron garnet, we observe the excitation of excessive phonons driven by non-equilibrium magnons, demonstrating the magnetic control of phonons. Furthermore, our time-resolved experiments reveal the magnetic field-dependent phononic thermal conductivity, signaling the potential of magnetic manipulation of heat transport. Our finding indicates that phonons can be controlled by magnetic means through magnon-phonon coupling and thereby opens a new avenue to harness magneto-thermoelectric effects in magnetic insulators. The coupling between magnons and phonons is an important aspect of condensed matter physics, but most research is related to magnon relaxation effects rather than the impact on phonon transport. Here, the effect of magnon-phonon coupling on phonon excitation, relaxation, and transport is investigated by time-resolved magneto-optical reflectometry.
长期以来,磁子与声子之间的耦合及其相关现象一直是凝聚态物理学的研究重点。与公认的磁子弛豫作用相反,它对声子传输的影响在很大程度上仍未被探索。在这里,我们利用磁光反射仪研究了磁子-声子耦合对声子激发、弛豫和传输的影响,从而填补了这一空白。通过同时测量磁绝缘体铥铁榴石中的磁子和声子群,我们观察到非平衡磁子驱动的过度声子激发,证明了声子的磁控制。此外,我们的时间分辨实验还揭示了与磁场相关的声子热导率,表明磁性操纵热传输的潜力。我们的发现表明,声子可以通过磁子-声子耦合以磁力手段进行控制,从而为利用磁绝缘体中的磁热电效应开辟了一条新途径。磁子与声子之间的耦合是凝聚态物理学的一个重要方面,但大多数研究都与磁子弛豫效应有关,而不是对声子传输的影响。这里,我们通过时间分辨磁光反射仪研究了磁子-声子耦合对声子激发、弛豫和传输的影响。
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引用次数: 0
Diverse electronic landscape of the kagome metal YbTi3Bi4 可可金属 YbTi3Bi4 的多样化电子景观
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-03 DOI: 10.1038/s43246-024-00681-3
Anup Pradhan Sakhya, Brenden R. Ortiz, Barun Ghosh, Milo Sprague, Mazharul Islam Mondal, Matthew Matzelle, Iftakhar Bin Elius, Nathan Valadez, David G. Mandrus, Arun Bansil, Madhab Neupane
Kagome lattices have emerged as an ideal platform for exploring exotic quantum phenomena in materials. Here, we report the discovery of Ti-based kagome metal YbTi3Bi4 which we characterize using angle-resolved photoemission spectroscopy (ARPES) and magneto-transport, in combination with density functional theory calculations. Our ARPES results reveal the complex fermiology of YbTi3Bi4 and provide spectroscopic evidence of four flat bands. Our measurements also show the presence of multiple van Hove singularities originating from Ti 3d orbitals and a linearly-dispersing gapped Dirac-like bulk state at the $$overline{,{mbox{K}},}$$ point in accord with our theoretical calculations. Our study establishes YbTi3Bi4 as a platform for exploring exotic phases in the wider LnTi3Bi4 (Ln = lanthanide) family of materials. Kagome lattices have emerged as an ideal platform for exploring exotic quantum phenomena in materials. Here, the discovery of a Ti-based kagome metal YbTi3Bi4 is reported, showing spectroscopic evidence of four flat bands originating from both Yb 4f and Ti 3d orbitals, multiple van Hove singularities, and a linearly dispersing gapped Dirac-like bulk state.
卡戈米晶格已成为探索材料中奇异量子现象的理想平台。在此,我们报告了钛基卡戈米金属 YbTi3Bi4 的发现,并结合密度泛函理论计算,使用角度分辨光发射光谱(ARPES)和磁传输对其进行了表征。我们的 ARPES 结果揭示了 YbTi3Bi4 的复杂费米学,并提供了四个平坦带的光谱证据。我们的测量结果还显示,在 $$overline,{mbox{K}},}$ 点存在多个源于 Ti 3d 轨道的范霍夫奇点和线性弥散的间隙狄拉克样体态,这与我们的理论计算结果一致。我们的研究将 YbTi3Bi4 树立为探索更广泛的 LnTi3Bi4(Ln = 镧系元素)材料家族中奇异相的平台。卡戈米晶格已成为探索材料中奇异量子现象的理想平台。本文报告了钛基卡戈米金属 YbTi3Bi4 的发现,其光谱显示了源自镱 4f 和钛 3d 轨道的四条平带、多个范霍夫奇点以及线性弥散的间隙狄拉克样体态。
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引用次数: 0
Probing the limits for coherent optical control of a mechanically decoupled defect center in hexagonal boron nitride 探测六方氮化硼中机械解耦缺陷中心的相干光控制极限
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-03 DOI: 10.1038/s43246-024-00686-y
Michael K. Koch, Vibhav Bharadwaj, Alexander Kubanek
The coherent control of a two-level system is among the most essential challenges in modern quantum optics. Understanding its fundamental limitations is crucial, also for the realization of next generation quantum devices. The quantum coherence of a two-level system is fragile in particular, when the two levels are connected via an optical transition, which, at the same time, enables the manipulation of the system. When such quantum emitters are located in solids the coherence suffers from the interaction of the optical transition with the solid state environment, which requires the sample to be cooled to temperatures of a few Kelvin or below. Here, we use a mechanically isolated quantum emitter in hexagonal boron nitride to explore the individual mechanisms which affect the coherence of an optical transition under resonant drive. We operate the system at the threshold where the mechanical isolation collapses in order to study the onset and temperature-dependence of dephasing and independently of spectral diffusion. The insights on the underlying physical decoherence mechanisms reveal a limit in temperature until which coherent driving of the system is possible. This study enables to increase the operation temperature of hBN-based quantum devices, therefore reducing the need for cryogenic cooling. The coherent control of a two-level system is at the core of quantum devices and understanding decoherence mechanisms is crucial for increasing their operating temperatures. Here, a mechanically isolated quantum emitter in hexagonal boron nitride is used to explore the individual mechanisms affecting the coherence of an optical transition under resonant drive.
两级系统的相干控制是现代量子光学最基本的挑战之一。了解其基本局限性对于实现下一代量子设备也至关重要。两级系统的量子相干性非常脆弱,尤其是当两级系统通过光学转换连接在一起时。当这种量子发射器位于固体中时,其相干性会受到光学转变与固态环境相互作用的影响,这就要求将样品冷却到几开尔文或更低的温度。在这里,我们利用六方氮化硼中机械隔离的量子发射器来探索在共振驱动下影响光学转变相干性的各种机制。我们在机械隔离崩溃的阈值下运行该系统,以研究去相干的开始和温度依赖性,并独立于光谱扩散。对基本物理退相干机制的深入研究揭示了一个温度极限,在此温度极限之前,系统的相干驱动是可能的。这项研究有助于提高基于 hBN 的量子器件的工作温度,从而减少对低温冷却的需求。两级系统的相干控制是量子器件的核心,了解退相干机制对于提高其工作温度至关重要。在此,我们利用六方氮化硼中机械隔离的量子发射器来探索在共振驱动下影响光学转变相干性的各种机制。
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引用次数: 0
Giant antisymmetric magnetoresistance arising across optically controlled domain walls in the magnetic Weyl semimetal Co3Sn2S2 磁性韦尔半金属 Co3Sn2S2 中光学控制畴壁产生的巨大反对称磁阻
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-02 DOI: 10.1038/s43246-024-00688-w
Kohei Fujiwara, Kazuma Ogawa, Naotaka Yoshikawa, Koji Kobayashi, Kentaro Nomura, Ryo Shimano, Atsushi Tsukazaki
Domain walls (DWs) in magnetic materials host various interesting magneto-transport phenomena. Recent theoretical proposals focusing on DWs of magnetic Weyl semimetals (mWSMs) suggest the emergence of even more exotic transport owing to topologically protected Weyl domains with opposite chirality. However, techniques for controlling and characterizing DWs in mWSMs have not yet matured sufficiently to identify the distinct features of electrical conduction on DWs. Here, by adopting an optical technique to manipulate magnetic domains in mWSM Co3Sn2S2 Hall-bar devices, we discover giant antisymmetric magnetoresistance arising across a DW formed by serially connected upward- and downward-magnetized Weyl domains. This phenomenon originates from the large tangent of the Hall angle associated with the intrinsic anomalous Hall effect in the oppositely magnetized Weyl domains. Furthermore, we quantitatively evaluate DW resistance by systematically controlling the number of DWs. These results underscore the promising avenue of Weyl DW engineering for advanced research on topological magnets. Domain walls in magnetic Weyl semimetals are a source of exotic transport owing to topologically protected domains with opposite chirality. Here, utilizing an optical technique to manipulate magnetic domains in Co3Sn2S2 Hall-bar devices, the authors discover giant antisymmetric magnetoresistance across a domain wall formed by serially connected upward- and downward-magnetized Weyl domains.
磁性材料中的畴壁(DWs)承载着各种有趣的磁传输现象。最近针对磁性韦尔半金属(mWSMs)的畴壁提出的理论建议表明,由于具有相反手性的拓扑保护韦尔畴,会出现更为奇特的传输现象。然而,控制和表征 mWSM 中 DW 的技术尚未成熟到足以识别 DW 上电导的独特特征。在这里,通过采用光学技术操纵 mWSM Co3Sn2S2 霍尔条器件中的磁畴,我们发现了由上下磁化的 Weyl 磁畴串联形成的 DW 上产生的巨大非对称磁阻。这种现象源于霍尔角的大正切,而霍尔角的大正切与对置磁化韦尔域中的固有反常霍尔效应有关。此外,我们还通过系统控制 DW 的数量对 DW 电阻进行了定量评估。这些结果突出表明,Weyl DW 工程在拓扑磁体的高级研究中大有可为。由于具有相反手性的拓扑保护畴,磁性韦尔半金属中的畴壁是奇异传输的来源。在这里,作者利用光学技术操纵 Co3Sn2S2 霍尔条器件中的磁畴,发现了由上下磁化的韦尔畴串联形成的畴壁上的巨大不对称磁阻。
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引用次数: 0
Author Correction: Face-centered cubic carbon as a fourth basic carbon allotrope with properties of intrinsic semiconductors and ultra-wide bandgap 作者更正:面心立方碳是具有本征半导体特性和超宽带隙的第四种基本碳同素异形体
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-31 DOI: 10.1038/s43246-024-00683-1
Igor Konyashin, Ruslan Muydinov, Antonio Cammarata, Andrey Bondarev, Marin Rusu, Athanasios Koliogiorgos, Tomáš Polcar, Daniel Twitchen, Pierre-Olivier Colard, Bernd Szyszka, Nicola Palmer
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引用次数: 0
Author Correction: Achieving liquid processors by colloidal suspensions for reservoir computing 作者更正:通过胶体悬浮实现液体处理器,用于水库计算
IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-10-31 DOI: 10.1038/s43246-024-00685-z
Raphael Fortulan, Noushin Raeisi Kheirabadi, Alessandro Chiolerio, Andrew Adamatzky
{"title":"Author Correction: Achieving liquid processors by colloidal suspensions for reservoir computing","authors":"Raphael Fortulan, Noushin Raeisi Kheirabadi, Alessandro Chiolerio, Andrew Adamatzky","doi":"10.1038/s43246-024-00685-z","DOIUrl":"10.1038/s43246-024-00685-z","url":null,"abstract":"","PeriodicalId":10589,"journal":{"name":"Communications Materials","volume":" ","pages":"1-1"},"PeriodicalIF":7.5,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s43246-024-00685-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142574234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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