ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 22
·2100680
·
IF 18.808
Baoqiang Zhang,Qiangqiang Zhang,Peng He,Yanbin Ma,Lei Shen,Xingyi Zhang,Youhe Zhou
Superconducting YBa 2 Cu 3 O 7− x (YBCO) bulks have demonstrated promising applications in quasi-permanent magnets, levitation, etc. Recently, the applications of bulk superconductors have been proposed, such as in portable, ultralight superconducting devices. These applications require bulk superconductors with lightweight, complex morphology, and good processability. However, the traditional fabrication method of YBCO bulks requires prolonged supplemental oxygenation and produces limited geometries with many randomly distributed cracks. This, combined with the inherent brittleness of the ceramic material, seriously impedes its wide application. In this study, a YBCO bulk with a multiscale hierarchical geometric configuration is constructed by a direct-ink-writing-based 3D-printing process. The 3D-printed YBCO green bodies exhibit a robust structure after directional freezing, which promotes intimate contact between the precursor particles in the deposited layers. This technology offers the advantage of a low shrinkage of 13.6 vol% after sintering at 920 °C. The 3D-printed bulks show lightweight, highly crystalline, and good electromagnetic properties compared with those produced by traditional cold-pressed sintering. Importantly, the multilevel void structure with a large specific surface area significantly reduces the oxygenation time and retains superconductivity. The proposed 3D-printing process can be adopted for the industrial production of superconducting bulk with complex geometries for novel applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Nature Physics
·
2017
·Vol. 14
·期 2
·134-139
·
IF 22.806
Du Zengyi,Yang Xiong,Altenfeld Dustin,Gu Qiangqiang,Yang Huan,Eremin Ilya,Hirschfeld Peter J.,Mazin Igor I.,Lin Hai,Zhu Xiyu,Wen Hai-Hu
Iron pnictides are the only known family of unconventional high-temperature superconductors besides cuprates. Until recently, it was widely accepted that superconductivity is driven by spin fluctuations and intimately related to the fermiology, specifically, hole and electron pockets separated by the same wavevector that characterizes the dominant spin fluctuations, and supporting order parameters (OP) of opposite signs1,2. This picture was questioned after the discovery of intercalated or monolayer form of FeSe-based systems without hole pockets, which seemingly undermines the basis for spin-fluctuation theory and the idea of a sign-changing OP3,4,5,6,7,8,9,10,11. Using the recently proposed phase-sensitive quasiparticle interference technique, here we show that in LiOH-intercalated FeSe compound the OP does change sign, albeit within the electronic pockets. This result unifies the pairing mechanism of iron-based superconductors with or without the hole Fermi pockets and supports the conclusion that spin fluctuations play the key role in electron pairing.
研究领域:
物理学
·
超导性
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yao Wang,Yamin Li,Bing Xu,Jiaying Ren,Kangkang Wang,Liang Zhang,Zhixian He,Wen Zhang,Shengnan Zhang
Titanium dioxide (TiO 2 ) ceramic coating, characterized by high thermal conductivity and remarkable chemical stability, leading to extensive application in providing electrical insulation within superconducting coils. However, the development of such ceramic insulation coatings to facilitate the preparation of high-performance superconducting magnets is extremely challenging, due to the complex heat treatment process of bismuth system high temperature superconductivity (HTS) wires. A novel strategy for fabricating a porous TiO 2 insulation layer with a three-dimensional (3D) reticular architecture based on highly dispersed ceramic slurry has been reported herein. To enhance the structural strength and oxygen permeability of the coating, polyethylene glycol and oligomeric ethyl silicate were introduced as modifiers to construct a grid-like porous framework. The as-prepared insulation coating possesses micron-sized pore and crack structures. The high-temperature stability of the insulation layer and its compatibility with the heat treatment of Ag-sheathed Bi-2223 wire was verified by measuring the effect of coating on the critical current. X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDS) show that this insulation coating with a thickness of approximately 25 μm can significantly inhibit the diffusion of metal sheath components and Bi. In addition, the TiO 2 insulation coating has also been successfully prepared on Bi-2223 tape by a reel-to-reel coating system. The results indicates that the TiO 2 insulation coating has great application potential as an insulation material for HTS magnets and provides new insights for the development of effective insulation material for Bi-2212 wires.
研究领域:
材料科学
·
超导技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Futures
·
2022
·Vol. 1
·期 4
·045201
·
IF 0
Kangqiao Cheng,Wei Xie,Shuo Zou,Huanpeng Bu,Jin-Ke Bao,Zengwei Zhu,Hanjie Guo,Chao Cao,Yongkang Luo
Rhodium-containing compounds offer a fertile playground to explore novel materials with superconductivity (SC) and other fantastic electronic correlation effects. A new ternary rhodium-antimonide La2Rh_{3+\delta}Sb4 (\delta\approx 1/8) has been synthesized by a Bi-flux method. It crystallizes in the orthorhombic Pr2Ir3Sb4-like structure, with the space group Pnma (No. 62). The crystalline structure appears as stacking the two-dimensional RhSb4- and RhSb5-polyhedra networks along b axis, and the La atoms embed in the cavities of these networks. Band structure calculations confirm it as a multi-band metal with a van-Hove singularity like feature at the Fermi level, whose density of states are mainly of Rh-4d and Sb-5p characters. The calculations also imply that the redundant Rh acts as charge dopant. SC is observed in this material with onset transition at T_c^\mathrm{on}\approx 0.8 K. Ultra-low temperature magnetic susceptibility and specific heat measurements suggest that it is an s-wave type-II superconductor. Our work may also imply that the broad Ln_2Tm_{3+\delta}Sb4 (Ln = rare earth, Tm = Rh, Ir) family may host new material bases where new superconductors, quantum magnetism and other electronic correlation effects could be found.
研究领域:
凝聚态物理学
·
材料科学
✓ 已验证
DOI
Physica Status Solidi-Rapid Research Letters
·
2020
·Vol. 15
·期 4
·2000563
·
IF 2.291
Xinhua Li,Qingshuang Ma,Ji Dong,Tansir Ahamad,Zongqing Ma
The Nb 3 (Al 1− x Sn x ) superconductor with enhanced critical current density ( J c ) is prepared by the process of mechanical alloying (MA) and subsequent low-temperature sintering and the enhancement mechanism of J c in Nb 3 (Al 1− x Sn x ) is discussed. The analysis of the flux pinning force implies that there is an additional pinning mechanism apart from grain boundary pinning in Nb 3 (Al 1− x Sn x ). The existence of dispersed Nb 2 Al nanoparticles (<30 nm) in Nb 3 (Al 1− x Sn x ) is confirmed by microstructure observation. These nanosized Nb 2 Al particles can serve as flux pinning centers, which leads to the increase of the flux pinning force as well as the enhancement of Nb 3 (Al 1− x Sn x )'s J c performance.
研究领域:
材料科学
·
超导研究
✓ 已验证
产品关联
DOI
高影响因子
National Science Review
·
2023
·Vol. 10
·期 3
·
IF 20.6
Zhang Baoqiang,Zhang Xingyi,Zhou You-He
The inherent brittleness and low sustainability of YBa2Cu3O7–x (YBCO) bulk superconductor seriously impede its wide applications. It is a great challenge to achieve toughening of this material and maintain its invariable superconductivity at the same time. Here, we fabricate bulk YBCO composite superconductor with a density of 2.15 g cm−3, which consists of interlocking dual network construction and shows high toughness and durability. The results show that its unit normalized fracture energy at 77 K reaches 638.6 kN m−2, which is ∼14.8 times that of YBCO bulk prepared by the top-seeded melt textured growth (TSMTG) method. Its critical current shows no degradation during the toughening process. Moreover, after 10 000 cycles, the sample does not fracture with the decay of critical current at 4 K of 14.6% whereas the TSMTG sample fractures only after 25 cycles.
研究领域:
材料科学
·
超导技术
✓ 已验证
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 131
·期 1
·1-7
·
IF 2.5
Guo Yiming,Zhang Lei,Zhao Yong,Huang Mei,Xu Min,Zhang Yong
This research employed the powder-in-tube (PIT) method to facilitate the introduction of the non-metallic element iodine (I) into the preparation of Nb 3 Al superconducting wires. After heating in a tube furnace, a rapid heating, quenching, and transformation (RHQT) treatment was conducted. It was observed that as the quantity of iodine introduced increased, the extent of the Nb/Al reaction also rose, indicating that a certain amount of iodine can be introduced to facilitate the Nb/Al reaction, thereby enabling Nb to react more fully with Al in the subsequent process and generating a Nb 3 Al superconducting phase that is closer to the stoichiometric ratio. Wires with iodine contents of 1.0 wt%, 1.5 wt%, and 2.0 wt% exhibited a diffusion layer at the Nb/Al interface after heating in a tube furnace at 1000 °C for 30 min. The primary component of the diffusion layer was Nb 2 Al. No diffusion layer was observed in the pure sample or in the group with 0.5 wt% I. However, a eutectic phase was present at the edge of Nb and Al. The wires with 1.0 wt% and 1.5 wt% I exhibited higher critical temperatures ( T c ) of 18.236 K and 17.421 K, respectively, than the pure sample. Additionally, they demonstrated superior critical current density ( J c ) properties compared to the pure sample.
研究领域:
材料科学
·
超导研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Fan Sun,Zhongnan Guo,Huanhuan Zhang,Wenxia Yuan
Previous study suggested that Se-site doping with Te or S in tetragonal FeSe adjusts the superconductivity only by expanding or compressing the lattice parameters . However, three chalcogens X ( X = S, Se, Te) show different electronegativity, which could directly change the interaction between Fe & X , and their electronic structures. In order to understand this underlying mechanism, the samples with different anion compositions but the same lattice parameters are required. In this work, two superconductors : FeSe 0.95 Te 0.03 S 0.02 and FeSe 0.9 Te 0.057 S 0.043 have been synthesized by solid state reaction. The thus-obtained samples have the same lattice parameters in tetragonal single phase as that of undoped FeSe. It is found that despite the unchanged lattice, S/Te co-doping on Se-site still increased the density of the electronic states (DOS) near the Fermi level, thereby enhanced the superconductivity. Our results suggest that the influence of Se-site doping with the same valence chalcogen in superconducting FeSe is not simply in the view of the lattice size, effects on electronic structures originated from different electronegativity during Se-site doping should also be considered.
研究领域:
凝聚态物理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2016
·Vol. 7
·期 1
·1-8
·
IF 11.329
Du Zengyi,Yang Xiong,Lin Hai,Fang Delong,Du Guan,Xing Jie,Yang Huan,Zhu Xiyu,Wen Hai-Hu
In the field of iron-based superconductors, one of the frontier studies is about the pairing mechanism. The recently discovered (Li 1− x Fe x )OHFeSe superconductor with the transition temperature of about 40 K provides a good platform to check the origin of double superconducting gaps and high transition temperature in the monolayer FeSe thin film. Here we report a scanning tunnelling spectroscopy study on the (Li 1− x Fe x )OHFeSe single crystals. The tunnelling spectrum mimics that of the monolayer FeSe thin film and shows double gaps at about 14.3 and 8.6 meV. Further analysis based on the quasiparticle interference allows us to rule out the d -wave gap, and for the first time assign the larger (smaller) gap to the outer (inner) Fermi pockets (after folding) associating with the d xy ( d xz /d yz ) orbitals, respectively. The gap ratio amounts to 8.7, which demonstrates the strong coupling mechanism in the present superconducting system.
研究领域:
凝聚态物理
·
超导研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Huchen Shu,Wei Zhong,Jiajia Feng,Hongyang Zhao,Yongjin Chen,Fang Hong,Binbin Yue
Abstarct Generally, superconductivity (SC) is expected to be absent in magnetic systems. However, this assumption was disturbed by unconventional superconductors, such as cuprates, iron-based superconductors, and the recently-discovered nickelate, since their superconductivity is proposed to be related to the electron-electron interaction mediated by the spin fluctuation. The study of the correlation between SC and magnetism (mostly antiferromagnetism) has been an important topic in understanding the SC mechanism. However, the coexistence of superconductivity and ferromagnetism (FM) is still rare in both conventional and unconventional superconductors. In this work, we report the observation of these two quantum orderings in high-entropy carbide ceramics (Mo 0.2 Nb 0.2 Ta 0.2 V 0.2 W 0.2 )C 0.9 , (Ta 0.25 Ti 0.25 Nb 0.25 Zr 0.25 )C. A clear magnetic hysteresis loop was observed in these high-entropy carbides, indicating a ferromagnetic (FM) ground state, with such an FM ordering even existing above room temperature. A sharp superconducting transition is observed in (Mo 0.2 Nb 0.2 Ta 0.2 V 0.2 W 0.2 )C 0.9 with a T c of 3.4 K and upper critical field of ∼3.37 T. Meanwhile, superconductivity is suppressed to some extent, and the zero-resistance state disappears in (Ta 0.25 Ti 0.25 Nb 0.25 Zr 0.25 )C, in which stronger ferromagnetism is presented. The upper critical field of (Ta 0.25 Ti 0.25 Nb 0.25 Zr 0.25 )C is only ∼1.5 T, though they show a higher transition temperature near 5.7 K. The ferromagnetism stems from the carbon vacancies. The concurrence of SC and FM ordering within the same system, whether through coexistence or phase separation at the microscopic level, provides an exotic platform to study the correlation between superconductivity and magnetism, along with other emerging quantum phenomena, significantly benefitting the design of multifunctional electronic devices.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 46
·21402-21410
·
IF 4.682
Wang J.,Ou X. L.,Zhang J.,Chen X. Y.,Zhao K.,Yang X. S.,Zhao Y.
Fe(Te,Se) is a simple, iron-based compound that is conducive to the study of superconductivity mechanisms and has potential for large-scale applications. At present, Fe(Te,Se) thin films are primarily prepared using the pulsed laser deposition method. Herein, FeTe 0.6 Se 0.4 films were grown by magnetron sputtering on CaF 2 substrates. The effect of sputtering pressure on the superconductivity of the film was investigated. Excessive pressure caused a higher iron content, which affected the superconductivity and prevented it from completely reaching a zero-resistance state. Δ T c was smaller for the film grown under 0.2 Pa, and its upper critical field reached 144.35 T, which indicates its greater application potential. Our results illustrated that sputtering pressure was a critical process parameter, which provided an important reference for future research to fabricate commercial iron-based superconducting tapes by magnetron sputtering.
研究领域:
凝聚态物理
·
材料科学
·
超导材料
·
薄膜制备
·
应用物理学
✓ 已验证
DOI
高影响因子
SEMICONDUCTORS
·
2025
·Vol. 59
·期 2
·129-138
·
IF 0.6
Cao Shuai,Zou Mengyu,Sun Yanchen,Gao Congben,Fan G. W.
A β-FeSe superconductor was synthesized by use of the explosive compaction aided by post-thermal treatment. The temperature of the explosive compact was measured during the experiment to be 58.2 ± 0.5°C, and its intrinsic mechanism were analyzed through theoretical simulation. The superconducting properties of the sample were measured using a physical property measurement system. The results shown that the compact before heat treatment exhibited semiconducting characteristics, the compact after heat treatment at a maximum temperature of 500°C exhibited superconductivity at 8 K. The sample exhibited metallic behavior prior to reaching 8 K. An anomaly in resistance was observed in the vicinity of 90 K, which indicated a structural phase transition. The diamagnetic fraction volume reached 47% calculated based on ZFC data. It is evident that the explosive compaction methods can serve as a valuable adjunct to existing research methodologies for superconducting materials.
研究领域:
凝聚态物理
·
材料科学
·
超导材料
·
粉末冶金
·
热处理技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）