Article
Materials Science, Multidisciplinary
N. B. Bolotina, O. N. Khrykina, A. N. Azarevich, N. Yu Shitsevalova, V. B. Filipov, S. Yu Gavrilkin, K. Mitsen, V. V. Voronov, N. E. Sluchanko
Summary: Inhomogeneous superconductivity in ZrB12 was studied using heat capacity and x-ray diffraction data. Evidence of two-gap superconductivity was found when a magnetic field was applied along the [110] axis, while a single gap was observed when the magnetic field was applied along the [100] axis. These findings are consistent with the checkerboard-type patterns observed in the electron density distribution.
Article
Physics, Multidisciplinary
YuXing Zhou, Bin Li, ZheFeng Lou, HuanCheng Chen, Qin Chen, BinJie Xu, ChunXiang Wu, JianHua Du, JinHu Yang, HangDong Wang, MingHu Fang
Summary: The study demonstrates that TlSb compound possesses Dirac surface states and may serve as a simple material platform for fault-tolerant quantum computations based on calculations and experimental results.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Physics, Applied
N. Tutt, J. Congreve, Y. Shi, D. Namburi, A. Dennis, H. Druiff, J. Durrell
Summary: This study presents a technique of fabricating superconducting joints between GdBCO-Ag bulk superconductors using YBCO-Ag as an intermediate joining material. The joints provide reliable connections between multiple bulk superconductors, addressing the challenges in fabricating large superconductors or shaping hard and brittle ones. The experiment joined nine single grains of GdBCO-Ag with a YBCO-Ag intermediate and investigated the effect of different orientations on the superconducting properties of jointed samples. The results showed that the jointing process led to degradation of critical temperature and critical current, as well as inhibited current flow due to silver diffusion and formation of large pores at the joint interface.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Mechanics
Hao Chen, Huadong Yong, Youhe Zhou
Summary: In this paper, the magnetic field and displacement distributions are used to detect cracks in bulk superconductors. A combination of Genetic Algorithm (GA) and magnetic field is employed to determine the position and shape of the crack, and the electromagnetic force is obtained based on the magnetic field distribution. The Extend Finite Element Method (XFEM) is utilized to calculate the displacement of the bulk superconductor with a crack. The comparison between magnetic field detection and displacement detection shows that displacement detection is more effective for horizontal cracks.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Ceramics
YanLan Cui, WanMin Yang, TingTing Wu, Abulaiti Abulizi, Miao Wang
Summary: A single domain GdBCO bulk superconductor was used to investigate the mechanism of levitation force. The results showed that the remainder trapped field is the key factor in determining the levitation force. An ideal physical model was proposed to analyze and formulate the levitation force.
CERAMICS INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Tsuneya Yoshida, Yasuhiro Hatsugai
Summary: This study reveals that diffusive systems can serve as a new platform for studying topological phenomena, demonstrating robust edge states protected by winding number in one- and two-dimensional systems. Furthermore, a novel diffusion phenomenon is discovered through numerical simulations, where a temperature field with a specific wavenumber cannot diffuse into the bulk due to the complete localization of edge states.
SCIENTIFIC REPORTS
(2021)
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
Materials Science, Multidisciplinary
P. F. Shan, Q. X. Dong, P. T. Yang, L. Xu, Z. Y. Liu, L. F. Shi, N. N. Wang, J. P. Sun, Y. Uwatoko, G. F. Chen, B. S. Wang, J-G Cheng
Summary: Pressurized AMn6Bi5 (A = K, Rb, Cs) compounds are a new family of ternary manganese-based superconductors that exhibit a broad superconducting dome with a maximum critical temperature up to similar to 9.5 K next to the long-range antiferromagnetic phase. The compound NaMn6Bi5, with a smaller A-site cation and lower antiferromagnetic transition temperatures T1 approximate to 46 K and T2 approximate to 52 K, is expected to show superconductivity at lower pressures. However, our high-pressure electrical transport measurements on chemically precompressed NaMn6Bi5 single crystals reveal the absence of bulk superconductivity near the magnetic quantum critical point, suggesting the presence of filamentary superconductivity.
Article
Physics, Multidisciplinary
Richard Hess, Henry F. Legg, Daniel Loss, Jelena Klinovaja
Summary: In this study, we investigate a one-dimensional Rashba nanowire with multiple Andreev bound states forming an Andreev band in the bulk. We demonstrate that, under certain conditions, this trivial Andreev band can exhibit a noticeable closing and reopening of the bulk band gap in the nonlocal conductance of the nanowire. Additionally, we find that the presence of trivial zero-bias peaks in the local conductance at the ends of the nanowire does not significantly affect the existence of the trivial bulk reopening signature. The coexistence of the trivial bulk reopening signature and zero-bias peaks mimics the essential characteristics required for the topological gap protocol, providing a topologically trivial minimal model for benchmarking the applicability of this protocol.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Ceramics
YanLan Cui, WanMin Yang, XueXue Yan, TingTing Wu
Summary: A novel multi-seeding (NMS) method is proposed to improve the performances of GdBCO samples by optimizing the shapes and space configurations of single-domain GdBCO grains. Three multi-seeding GdBCO bulk superconductors were fabricated with different seeding techniques, and the results show that the NMS method has the largest levitation force and magnetic field coupling ratio, indicating its usefulness in improving the mechanical strength, homogeneity, and performances of multi-seeding GdBCO samples.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(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
Materials Science, Multidisciplinary
Jian-Ying Wu, Yi-Feng Hong
Summary: In this study, the mechanical stresses and multi-physical fracture in bulk high-temperature superconductors (HTS) during magnetization are systematically investigated using the phase-field cohesive zone model (PF-CZM). The effects of Lorentz electromagnetic forces and Joule heating on potential damage and fracture in bulk HTS are analyzed. Numerical results demonstrate the nucleation and propagation process of cracks under isothermal and non-isothermal conditions, as well as quantify the effects of Joule heating and cracking on electromagnetic performances. The proposed PF-CZM can be extended to optimize the fabrication and practical application of bulk HTS.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Ceramics
Monika Radusovska, Pavel Diko, Petra Hajdova, Daniela Volochova, Vitaliy Antal, Tomas Hlasek, Vladimir Plechacek, Filip Antoncik
Summary: Bulk single-grain GdBCO-Ag superconductors with and without holes were analyzed. Levitation force at 77 K is higher for the sample with holes. Defects arising during the absorption of the holes may negatively affect the macroscopic superconducting properties. Other microstructural features do not significantly affect the observed difference in macroscopic superconducting properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Review
Polymer Science
Goncalo Silva, Carlos Miguel Marto, Ines Amaro, Ana Coelho, Jose Sousa, Manuel Marques Ferreira, Ines Francisco, Francisco Vale, Barbara Oliveiros, Eunice Carrilho, Anabela Baptista Paula
Summary: Currently, composite resins are favored for restoring posterior teeth. Despite the appeal of bulk-fill resins, some dentists are hesitant to use them. This literature review compares the performance of bulk-fill resins and conventional resins in direct restorations of posterior teeth. The overall meta-analysis slightly favors the use of conventional resin over bulk-fill resin. However, bulk-fill resins simplify the clinical process and exhibit similar behavior to conventional resins in terms of properties.
Article
Materials Science, Multidisciplinary
Soumya Datta, Sandeep Howlader, Arushi, Ravi Prakash Singh, Goutam Sheet
Summary: Experimental exploration of the physics of anisotropic superconductors near a critical B point remains an unattained goal, and ZrB12 can be used as a model material system to study such phenomena.
Article
Chemistry, Multidisciplinary
Lukas Powalla, Max T. Birch, Kai Litzius, Sebastian Wintz, Fehmi S. Yasin, Luke A. Turnbull, Frank Schulz, Daniel A. Mayoh, Geetha Balakrishnan, Markus Weigand, Xiuzhen Yu, Klaus Kern, Gisela Schuetz, Marko Burghard
Summary: Topological charge has a significant role in various physical systems. The observation of real-space topological objects in magnetic materials has primarily been limited to skyrmions with a unitary topological charge. However, more exotic states with varying topology, such as antiskyrmions, merons, or bimerons, as well as 3D states like skyrmion strings, chiral bobbers, and hopfions, have recently been experimentally reported. The study of these states has the potential to open new avenues for research in topological magnetism and spintronic applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
B. Edwards, O. Dowinton, A. E. Hall, P. A. E. Murgatroyd, S. Buchberger, T. Antonelli, G. -r. Siemann, A. Rajan, E. Abarca Morales, A. Zivanovic, C. Bigi, R. V. Belosludov, C. M. Polley, D. Carbone, D. A. Mayoh, G. Balakrishnan, M. S. Bahramy, P. D. C. King
Summary: The electronic structure of V1/3NbS2 was investigated using photoemission spectroscopy, revealing a giant valley-selective Ising coupling induced by bulk magnetic order. This indicates how coupling of local magnetic moments to itinerant states of a transition metal dichalcogenide monolayer provides a powerful route to controlling their valley-spin splittings.
Article
Physics, Condensed Matter
Sawani Datta, Ram Prakash Pandeya, Arka Bikash Dey, A. Gloskovskii, C. Schlueter, T. R. F. Peixoto, Ankita Singh, A. Thamizhavel, Kalobaran Maiti
Summary: We studied the electronic structure of CeAgAs2, an antiferromagnetic Kondo lattice system, using hard x-ray photoemission spectroscopy. The results show surface-bulk differences, complex interplay of intra- and inter-layer covalency, and electron correlation in the electronic structure of CeAgAs2. The Ce and As core level spectra reveal strong hybridization and correlation effects. The bulk spectra exhibit additional interactions not present in the surface spectra. Temperature dependence of the spectra indicates a Kondo-like behavior.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Condensed Matter
S. Rayaprol, K. K. Iyer, A. Hoser, M. Reehuis, A. Morozkin, V Siruguri, K. Maiti, E. Sampathkumaran
Summary: A compound containing Tb ions, Tb5Si3, with a honeycomb network of Tb ions, shows complete suppression of the features attributable to long-range magnetic ordering by a critical applied field, mimicking the behavior of Kitaev physics candidates.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Jolanta Stankiewicz, Pedro Schlottmann, Javier Blasco, Monica Ciomaga Hatnean, Geetha Balakrishnan
Summary: We conducted an impedance study on SmB6 single crystals in-plane and out-of-plane at low temperatures and a wide frequency range. The dielectric behavior of the system, ranging from surface to bulk dominated electrical conduction, was described by a universal equivalent circuit between 2 and 10 K. We identified the contributions of resistance, capacitance, and inductance to the impedance. The obtained equivalent inductance decreased significantly with increasing temperature, indicating the transition to bulk controlled electrical conduction. Self-sustained voltage oscillations below 6 K, observed when applying a dc current to small crystals, suggest a large self-capacitance of SmB6 likely due to surface states.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Physical
Alevtina Smekhova, Alexei Kuzmin, Konrad Siemensmeyer, Chen Luo, James Taylor, Sangeeta Thakur, Florin Radu, Eugen Weschke, Ana Guilherme Buzanich, Bin Xiao, Alan Savan, Kirill V. V. Yusenko, Alfred Ludwig
Summary: The study investigates the structural, electronic, and magnetic properties of a high-entropy alloy using multi-edge X-ray absorption spectroscopy. The researchers reveal the local crystallographic ordering and component-dependent lattice displacements, as well as the oxidation states, electronic structure, and magnetic behavior of the alloy on the surface and in the sub-surface volume of the film. The study also evaluates the magnetic moments of Fe, Co, and Ni components.
Article
Crystallography
Manisha Islam, Monica Ciomaga Hatnean, Geetha Balakrishnan, Oleg A. A. Petrenko
Summary: Mn3Al2Ge3O12 is a garnet compound with high degree of geometrical frustration. It exhibits intriguing magnetic properties, including long range hidden order derived from multipoles formed from 10-spin loops. The crystal structure of Mn3Al2Ge3O12 is similar to the well-studied Gd garnets, and its magnetic properties are closest to those of gadolinium garnets. A large, high quality single crystal of Mn3Al2Ge3O12 was successfully grown by the floating zone method, allowing for detailed investigations of its magnetic properties.
Article
Chemistry, Inorganic & Nuclear
Kartik K. Iyer, Sudhindra Rayaprol, Ram Kumar, Shidaling Matteppanavar, Suneel Dodamani, Kalobaran Maiti, Echur V. Sampathkumaran
Summary: We investigate the electronic properties of R4PtAl (R = Ho and Er) using various measurements. Our results show antiferromagnetic order in Ho and Er compounds, as well as the presence of a spin-glass phase at lower temperatures. The resistivity data exhibit a weak minimum slightly above the respective Néel temperature, which is unusual for rare-earth materials with well-localized 4f states. We also observe a subtle field-induced magnetic transition and a large isothermal entropy change for both compounds. These findings provide insights for the development of magnetocaloric materials.
Article
Physics, Condensed Matter
A. S. Cameron, Y. Tymoshenko, P. Y. Portnichenko, A. S. Sukhanov, M. Ciomaga Hatnean, D. McK Paul, G. Balakrishnan, R. Cubitt, D. S. Inosov
Summary: In previous studies, the noncentrosymmetric superconductor Ru7B3 has shown unusual behavior in its vortex lattice, with vortices dissociating from the crystal lattice and exhibiting a complex field-history dependence. In this study, the vortex lattice form factor of Ru7B3 was investigated to check for deviations from established models. The results suggest that the anisotropic London model is a good fit, indicating minimal alterations to the vortex structure due to broken inversion symmetry. Penetration depth and coherence length were also extracted from the data.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Shin-ichi Shamoto, Hiroki Yamauchi, Kazuki Iida, Kazuhiko Ikeuchi, Amelia Elisabeth Hall, Yu-Sheng Chen, Min Kai Lee, Geetha Balakrishnan, Lieh-Jeng Chang
Summary: Local spin correlation orders, including partial order, cooperative paramagnetism, and soliton spin liquid, emerge in the paramagnetic state of the noncentrosymmetric intermetallic antiferromagnet Mn3RhSi. The study reveals that the local spin correlation order in Mn3RhSi has a spiral structure. The possible origins of magnetic cluster formation are discussed in relation to the Lifshitz invariant and the Griffiths phase, and compared with other materials.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jan Grunwald, Jorge Torres, Axel Buchholz, Christian Naether, Lea Kaemmerer, Manuel Gruber, Sebastian Rohlf, Sangeeta Thakur, Heiko Wende, Winfried Plass, Wolfgang Kuch, Felix Tuczek
Summary: The article reports a compound with unprecedented properties, which can maintain its high-spin state at high temperatures for a long period of time under light irradiation. The researchers attribute this behavior to the large structural difference between the two spin states and the four distortion coordinates associated with the spin transition, which drastically reduce the relaxation rate of the metastable high-spin state. These findings open up new strategies for developing compounds that exhibit light-induced excited spin state trapping (LIESST) at high temperatures, potentially around room temperature.
Article
Materials Science, Multidisciplinary
Peng Li, Huiqing Ye, Yong Hu, Yuan Fang, Zhiguang Xiao, Zhongzheng Wu, Zhaoyang Shan, Ravi P. Singh, Geetha Balakrishnan, Dawei Shen, Yi-feng Yang, Chao Cao, Nicholas C. Plumb, Michael Smidman, Ming Shi, Johann Kroha, Huiqiu Yuan, Frank Steglich, Yang Liu
Summary: In this study, direct spectroscopic evidence for the competition between magnetic order and the Kondo effect in a Kondo lattice system is found through high-resolution photoemission spectroscopy.
Article
Materials Science, Multidisciplinary
G. D. A. Wood, D. D. Khalyavin, D. A. Mayoh, J. Bouaziz, A. E. Hall, S. J. R. Holt, F. Orlandi, P. Manuel, S. Bluegel, J. B. Staunton, O. A. Petrenko, M. R. Lees, G. Balakrishnan
Summary: We investigate the magnetic structure of GdRu2Si2 using neutron diffraction and discover higher-order magnetic satellites. We refine a double-Q constant-moment model using powder diffraction and find that the structure contains vortexlike motifs with a one-dimensional topological charge density.
Article
Materials Science, Multidisciplinary
Ivar Kumberg, Evangelos Golias, Sebastien E. Hadjadj, Rahil Hosseinifar, Sangeeta Thakur, Tauqir Shinwari, Ismet Gelen, Niko Pontius, Christian Schuessler-Langeheine, Clemens von Korff Schmising, Sangeeta Sharma, Wolfgang Kuch
Summary: In this study, the magneto-optical response of Co to ultrashort laser excitation was investigated using x-ray resonant magnetic reflectivity (XRMR) with circular polarization. The time-resolved reflectivities for opposite sample magnetization were used to analyze the magnetic and nonmagnetic contributions, revealing information about the sample's structural, electronic, and magnetic properties. Different response times were observed for different contributions, and numerical simulations successfully reproduced the experimental results.
Article
Engineering, Electrical & Electronic
Alison C. Twitchett-Harrison, James C. Loudon, Ryan A. Pepper, Max T. Birch, Hans Fangohr, Paul A. Midgley, Geetha Balakrishnan, Peter D. Hatton
Summary: Skyrmion-based devices are a promising solution for low-energy data storage, but the geometry and edges of the devices significantly affect the behavior of skyrmions, which could lead to methods for controlling the position and number of skyrmions within device structures.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
