Article
Physics, Multidisciplinary
Rui-Xing Zhang, S. Das Sarma
Summary: The quasi-two-dimensional thin films of iron-based superconductors have been established as a new high-temperature platform for hosting intrinsic time-reversal-invariant helical topological superconductivity. Experimental results have shown that an applied electric field can serve as a topological switch for helical Majorana edge modes in FeSC thin films.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
L. N. Sang, Z. Li, G. S. Yang, Z. J. Yue, J. X. Liu, C. B. Cai, T. Wu, S. X. Dou, Y. W. Ma, X. L. Wang
Summary: Research on iron-based superconductors has made significant progress in the past decade, covering various aspects including high-pressure studies, superconductivity properties, and vortex dynamics. These studies have deepened our understanding of the mechanisms behind superconductivity.
MATERIALS TODAY PHYSICS
(2021)
Article
Multidisciplinary Sciences
Xianxin Wu, Xin Liu, Ronny Thomale, Chao-Xing Liu
Summary: In this research, we propose to create Majorana zero modes (MZMs) without heterostructures in the FeTe1-xSex monolayer by applying an in-plane magnetic field and tuning the local chemical potential via electric gating. Our study not only reveals the FeTe1-xSex monolayer as a promising Majorana platform with scalability and electrical tunability, but also provides a general principle to search for realistic realization of high-order topological superconductivity.
NATIONAL SCIENCE REVIEW
(2022)
Article
Physics, Applied
Karciano J. S. Silva, David A. Landinez-Tellez, Petrucio Barrozo, I. Garcia-Fornaris, J. Albino Aguiar
Summary: This study reports on the sintering, structural, morphological, electrical, and magnetic characterization of the superconducting FeSe0.88. The sample was prepared using the solid-state reaction method at 600 degrees C in an evacuated borosilicate tube. X-ray diffractograms revealed the formation of two minor impurity phases, Fe7Se8 and FeSe, both with hexagonal structures, which are not superconducting. Resistivity measurements showed the onset superconducting temperature at Tconset is approximately 8.6 K. Magnetic measurements demonstrated a ferromagnetic-paramagnetic phase transition around 875 K for the FeSe0.88 compound.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2023)
Article
Physics, Multidisciplinary
Jia Yu, Tong Liu, BinBin Ruan, Kang Zhao, QingSong Yang, MengHu Zhou, ZhiAn Ren
Summary: The study investigates the evolution of superconductivity and magnetism in EuFeAs2 and Eu0.9Pr0.1FeAs2 through cobalt doping. Cobalt doping has little effect on the Eu-related antiferromagnetic transition in EuFeAs2, but rapidly decreases the Fe-related spin density wave transition temperature, while inducing superconductivity. In Eu0.9Pr0.1FeAs2, magnetism and superconductivity show similar evolutions upon cobalt doping, with the highest transition temperature reaching 30.6 K.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Engineering, Electrical & Electronic
Yufeng Zhang, Tao Su, Qian Guo, Wentao Gao, Jinfei He, Tiantian Chen, Qixun Zhou
Summary: Research on the magnetization loss of multilayer high-temperature superconductor-coated conductors (CCs) shows that with increasing magnetic field frequency and intensity, the variation of magnetization loss for each layer differs significantly. The magnetization loss of the copper layer increases notably and gradually becomes the main source, replacing the superconducting layer. This research provides insights for improving equipment performance and reducing refrigeration cost in strong alternating magnetic field environments.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Multidisciplinary
V Gayathri, T. A. Sathyanarayana, K. Vinod, T. Geetha Kumary, Awadhesh Mani
Summary: The comparative study revealed that superconducting thin films grown on SrTiO3 substrate exhibited enhanced superconducting properties compared to films grown on LaAlO3 substrate. The microstructure of the films also played a role in affecting the critical current density.
Review
Chemistry, Physical
Qiang Hou, Longfei Sun, Yue Sun, Zhixiang Shi
Summary: The 11 system in the iron-based superconducting family has gained significant attention in the study of high-temperature superconductivity due to its simple structure and rich physical properties. The research on 11 iron-based superconductors has faced challenges in producing high-quality single crystals, but researchers have made progress in crystal growth over the past decade. This paper aims to provide a comprehensive summary of the preparation methods for 11 iron-based single crystals and discuss their quality, size, and superconductivity properties obtained through different techniques.
Article
Chemistry, Multidisciplinary
Lingyong Zeng, Xunwu Hu, Yazhou Zhou, Mebrouka Boubeche, Ruixin Guo, Yang Liu, Si-Chun Luo, Shu Guo, Kuan Li, Peifeng Yu, Chao Zhang, Wei-Ming Guo, Liling Sun, Dao-Xin Yao, Huixia Luo
Summary: This study reports the electronic structure and superconductivity properties of Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx high-entropy ceramics, and discovers that it may be a topological superconductor. The results show that Ti0.2Zr0.2Nb0.2Mo0.2Ta0.2Cx exhibits high superconducting critical temperature and maintains its superconductivity under high pressure.
Article
Materials Science, Multidisciplinary
M. Xu, J. Schmidt, E. Gati, L. Xiang, W. R. Meier, V. G. Kogan, S. L. Bud'ko, P. C. Canfield
Summary: In this study, the effects of Mn substitution on the superconducting and magnetic ground state of CaKFe4As4 were investigated. It was found that Mn substitution decreases the superconducting transition temperature and induces a magnetic transition. A temperature-composition phase diagram was constructed, and the influence of Mn substitution on the elastoresistivity and superconductivity under a magnetic field was also studied.
Article
Physics, Condensed Matter
Yves Noat, Alain Mauger, Minoru Nohara, Hiroshi Eisaki, Shigeyuki Ishida, William Sacks
Summary: This study revisits the experimental data of four different compounds and finds that the magnetic susceptibility can be described by the same function for all materials. It is observed that the magnetic and electronic contributions reveal the existence of the pseudogap. The analysis suggests a qualitative change of behavior between underdoped and overdoped regimes.
SOLID STATE COMMUNICATIONS
(2022)
Article
Physics, Applied
P. Gierlowski, B. Cury Camargo, I. Abaloszewa, A. Abaloszew, M. Jaworski, K. Cho, R. Prozorov, Y. Liu, T. A. Lograsso, M. Konczykowski
Summary: We have characterized an electron-irradiated Ba0.47K0.53Fe2As2 single-crystal using magneto-optic and microwave measurements, and restored its superconducting properties through annealing. The results demonstrate that the superconducting properties of Ba0.47K0.53Fe2As2 can be restored by a simple annealing process, and its behavior is similar to hole-doped copper oxides.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Ye Yang, Fanghang Yu, Xikai Wen, Zhigang Gui, Yuqing Zhang, Fangyang Zhan, Rui Wang, Jianjun Ying, Xianhui Chen
Summary: Based on electrical transport and XRD measurements, as well as first-principles calculations, researchers discover a unique pressure-induced Mott transition from an antiferromagnetic Mott insulator to a ferromagnetic Weyl metal in the iron oxychalcogenide La2O3Fe2Se2 around 37 GPa without any structural change. The theoretical calculations indicate that this insulator-metal transition is mainly due to the increased bandwidth and reduced electron correlation under high pressure. Moreover, the high-pressure ferromagnetic Weyl metallic phase exhibits attractive electronic band structures with six pairs of Weyl points near the Fermi level, which can be easily manipulated by a magnetic field.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Guodong Wang, Qingqing Meng, Yongjun Li, Xuan Li, Yixiao Zhou, Zihang Zhu, Congrui Gao, He Li, Wei Jiang, Shanghong Zhao
Summary: This paper proposes and investigates an approach for photonic generation of multilevel frequency-hopping (FH) microwave signal based on a Sagnac loop. The approach utilizes a tunable photonic filter consisting of connected Mach-Zehnder Interferometers (MZIs) driven by coding signals in the Sagnac loop to select frequency components from the input optical frequency comb (OFC) and generate multilevel FH microwave signal. The approach demonstrates high FH speed, wideband capability, and suitability for photonic integration, and the Sagnac loop ensures better signal performance through improved phase stability.
RESULTS IN PHYSICS
(2023)
Article
Physics, Multidisciplinary
Hu Jiang-Ping
Summary: The article introduces the gene concept for unconventional high temperature superconductors, discussing electronic environments that meet the gene condition and exploring the challenges and possibilities in finding new unconventional high temperature superconductors.
ACTA PHYSICA SINICA
(2021)
Article
Physics, Applied
D. Torsello, D. Gambino, L. Gozzelino, A. Trotta, F. Laviano
Summary: We investigated the expected neutron damage in high-temperature superconducting tapes used in compact fusion reactors. Monte Carlo simulations were performed to obtain the neutron spectrum and fluence at the magnet position, which were then used to calculate the energy distributions of primary knock-on atoms for each atomic species in the superconductor. Molecular dynamics simulations were used to characterize the displacement cascades in terms of size and morphology. The expected radiation environment was compared with the neutron spectrum and fluences achievable in current experimental facilities to identify similarities and differences that are relevant to the understanding of radiation hardness of these materials in real fusion conditions. Our findings show that different neutron spectra result in different damage regimes, irradiation temperature influences the number of defects generated, and neutron-superconductor interaction leads to local temperature increase. These observations suggest the need for further experimental investigations in different conditions and the necessity of neutron shielding in compact fusion reactors.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
M. Fracasso, F. Gomory, M. Solovyov, R. Gerbaldo, G. Ghigo, F. Laviano, S. Sparacio, D. Torsello, L. Gozzelino
Summary: In this study, the flux-jump occurrence in an MgB2 cup-shaped shield was numerically investigated using the finite element method and the COMSOL 6.0 Multiphysics (R) software. The computed shielding curves showed a good agreement with experimental data at different temperatures and positions. The validated model was then used to explore optimization routes by improving the thermal conductivity of the material and the thermal exchange between the device and the cooling stage.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Gianluca Ghigo, Daniele Torsello, Laura Gozzelino, Michela Fracasso, Mattia Bartoli, Cristian Pira, Davide Ford, Giovanni Marconato, Matteo Fretto, Ivan De Carlo, Nicola Pompeo, Enrico Silva
Summary: This study characterizes NbTi films operating at approximately 11 GHz and in DC magnetic fields up to 4 T using the coplanar waveguide resonator technique. It provides quantitative information about the penetration depth, complex impedance, and vortex-motion-induced complex resistivity. This characterization is crucial for the development of radiofrequency cavity technology.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Analytical
Silvia Zecchi, Fabrizio Ruscillo, Giovanni Cristoforo, Mattia Bartoli, Griffin Loebsack, Kang Kang, Erik Piatti, Daniele Torsello, Gianluca Ghigo, Roberto Gerbaldo, Mauro Giorcelli, Franco Berruti, Alberto Tagliaferro
Summary: By mixing red mud with hemp waste, biochar with high conductivity and good magnetic properties can be produced through carbothermal processes. The resulting biochar enriched with thermally-reduced red mud is then used to prepare epoxy-based composites, which are tested for their electric and magnetic properties.
Article
Nanoscience & Nanotechnology
Elham Sharifikolouei, Antoni Zywczak, Baran Sarac, Tomasz Koziel, Reza Rashidi, Piotr Bala, Michela Fracasso, Roberto Gerbaldo, Gianluca Ghigo, Laura Gozzelino, Daniele Torsello
Summary: In this study, Fi(40)Ni(40)B(20) metallic glass microfibers with a diameter of 5 μm were fabricated, and the influence of different melt-spinning wheel velocities on their structure and magnetic properties was investigated. Cylindrical magnetic field shields with anisotropic static field shielding behavior were obtained by wrapping the microfibers around a cast. Moreover, embedding the microfibers in an epoxy matrix significantly improved the electromagnetic properties of the composite at GHz frequencies.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Energy & Fuels
Samuele Meschini, Francesco Laviano, Federico Ledda, Davide Pettinari, Raffella Testoni, Daniele Torsello, Bruno Panella
Summary: This paper provides a comprehensive overview of nuclear fusion concepts for industrial applications, with a focus on the private sector. The designs are classified into three leading concepts: magnetic confinement, inertial confinement, and magneto-inertial confinement. The working principles of the main devices are described in detail, highlighting the strengths and weaknesses of each design. The importance of the public sector in private projects, technological maturity, and main criticalities of each project are also discussed. Additionally, the geographical distribution of companies and public institutions pursuing fusion device designs for commercial applications is reported.
FRONTIERS IN ENERGY RESEARCH
(2023)
Review
Physics, Applied
Erik Piatti, Daniele Torsello, Gianluca Ghigo, Dario Daghero
Summary: The iron-based compounds of the 12442 family, which originate from the intergrowth of 122 and 1111 building blocks, display unique properties and are similar to double-layer cuprates. Investigating their superconducting properties, particularly the order parameter symmetry, is crucial in understanding their relationship to cuprates. In this study, the authors compare their measurements in Rb-12442 with those from the literature and find that the compound possesses at least two gaps, one of which is nodal. The compatibility of these findings with theoretical models and previous results is thoroughly discussed.
LOW TEMPERATURE PHYSICS
(2023)
Article
Biotechnology & Applied Microbiology
Marta Miola, Cristina Multari, Nina Kostevsek, Roberto Gerbaldo, Francesco Laviano, Enrica Verne
Summary: The aim of this study was to design new hybrid nanoplatforms through the eco-friendly use of tannic acid for biomedical applications. The results demonstrate that the synthesized nanoparticles possess both magnetic and plasmonic properties and are non-toxic.
Article
Chemistry, Multidisciplinary
Erik Piatti, Daniele Torsello, Gaia Gavello, Gianluca Ghigo, Roberto Gerbaldo, Mattia Bartoli, Donatella Duraccio
Summary: The combination of conductive carbon and magnetic particles is an effective strategy to produce advanced fillers for polymer composites that can shield against microwave radiation. In this study, an iron-tailored biochar obtained from olive pruning pyrolysis was developed and characterized as a filler for epoxy composites. Extensive characterization was conducted to evaluate the electrical and magnetic properties of biochar-based composites with and without iron. The results showed that the composites with higher filler loading exhibited higher DC electrical conductivity and ferromagnetic behavior.
