In an isotropic vortex system of MgCNi_{3} single crystal, we first observed the collapse of the peak effect (PE), which is a sudden increase in the critical current (I_{c}) near the end of superconductivity. By moving magnetic vortices with dc and ac driving currents, we investigated the vortex dynamics related to the PE. For the dc driving, a sharp peak in I_{c} was observed. As the driving frequency increases, the PE was collapsed and observable flux creep was developed in contrast to the result obtained from the well-studied anisotropic system of NbSe_{2}. Because the vortex matter in our experimental situation is isotropic and has large correlation volume without severe deformation by pinning, the mobility of the vortex matter is intrinsically high. From the detailed observation, we are convinced that the PE is definitely a dynamic phenomenon.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.103.047003 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Application value of using a SaCo videolaryngeal mask airway combined with a bronchial blocker in patients undergoing minimally invasive thoracoscopic surgery.
Am J Transl Res
December 2024
Department of Anesthesiology, Xidian Group Hospital Xi'an 710077, Shaanxi, China.
Objective: To investigate the efficacy of the SaCo videolaryngeal mask airway (VLMA) in combination with a bronchial blocker in patients undergoing minimally invasive thoracoscopic surgery.
Methods: A retrospective analysis was conducted on the clinical data of 120 patients who underwent minimally invasive thoracoscopic surgery from January 2022 to December 2023. Patients were grouped based on their treatment methods: 68 patients who received the SaCo VLMA combined with a bronchial blocker intraoperatively were designated as the L group, while 52 patients who received a tracheal tube combined with a bronchial blocker intraoperatively were designated as the E group.
Biomechanical and clinically controlled study of different fenestration positions in vascularized iliac bone flaps for treating femoral head necrosis.
J Orthop Surg Res
January 2025
Department of Joint and Trauma Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
Background: No appropriate studies have been conducted that compare the biomechanical properties of different fenestration positions in deep circumflex iliac artery (DCIA)-vascularized iliac bone grafts for femoral head necrosis (ONFH) treatment. In this study, we aimed to explore the fenestration locations of DCIA-vascularized iliac grafting in ONFH treatment using FEA and clinical retrospective analysis.
Methods: We simulated an iliac bone flap transplantation with a vascularized tip by finite element analysis (FEA).
A tunable metamaterial microwave absorber inspired by chameleon's color-changing mechanism.
Sci Adv
January 2025
Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA.
A metamaterial absorber capable of swiftly altering its electromagnetic response in the microwave range offers adaptability to changing environments, such as tunable stealth capabilities. Inspired by the chameleon's ability to change color through the structural transformation of photonic lattice crystals, which shift the bandgaps of reflection and transmission of visible light, we designed a crisscross structure that transforms from an expanded to a collapsed form. This transformation enables a switch between broadband absorption and peak transmission in the microwave range (4 to 18 gigahertz).
View Article and Find Full Text PDFStudy on the mechanical response characteristics of sandstone under elasticity plasticity and full path unloading after peak stress.
Sci Rep
January 2025
Heilongjiang Ground Pressure and Gas Control in Deep Mining Key Laboratory, Heilongjiang University of Science and Technology, Harbin, 15002, China.
When underground tunnels in coal mines traverse geological structurally abnormal zones (faults, collapse columns, fractured zones, etc.), excavation-induced unloading leads to instability and failure of the engineering rock mass. Rock masses in fractured zones are in elastic, plastic, and post-peak stress states, and the process of excavation through these zones essentially involves unloading under full stress paths.
View Article and Find Full Text PDFStudy on the Properties of Basalt Fiber-Calcined Gangue-Silty Clay Foam Concrete for Filling Undermined Goaf Areas of Highways.
Materials (Basel)
December 2024
College of Water Resources and Construction Engineering, Shihezi University, Shihezi 832000, China.
The collapse of surface goaf beneath highways can result in instability and damage to roadbeds. However, filling the goaf areas with foam concrete can significantly enhance the stability of the roadbeds while considerably reducing the costs of filling materials. This study analyzes the effects on destructive characteristics, mechanical properties, stress-strain curve features, and relevant metrics, while also observing the microstructure of basalt fiber-calcined gangue-silty clay foam concrete (BF-CCG-SCFC).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!