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The critical temperature Tc and the critical current density Jc determine the limits to large-scale superconductor applications. Superconductivity emerges at Tc. The practical current-carrying capability, measured by Jc, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce Tc. Simultaneous increase of Tc and Jc in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both Tc and Jc together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. Tc is enhanced due to the nanoscale compressive strain and proximity effect, whereas Jc is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of Jc enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.
Pubmed ID: 27708268
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We''re called the National High Magnetic Field Laboratory because our magnets offer the highest magnetic fields for use by our international community of scientific visitors. But we could just as easily be called the National Unique Magnetic Field Laboratory, because many of our magnets and experimental techniques are highly specialized, yet broadly applicable to research in physics, materials science, chemistry, biochemistry, biology and even biomedicine. Our magnets are designed and built right here at the lab, and many are unrivalled anywhere in the world. They attract more than 1,000 visiting scientists from across the globe. Our scientists and technicians establish the experimental instrumentation and techniques that enable the scientific productivity of our user programs, which ultimately is how we, and the nation, measure our success. The only facility of its kind in the United States, the Magnet Lab is the largest and highest-powered magnet laboratory in the world, headquartered in a sprawling 370,000-square-foot complex near Florida State University in Tallahassee. The lab also includes sites at the Los Alamos National Laboratory in New Mexico and the University of Florida in Gainesville. Together these three institutions operate the lab, collaborating in a unique, interdisciplinary way to advance basic science, engineering and technology in the 21st century. the lab is a national resource open to both curious visitors and world-renowned scientists. Centralizing the country''s greatest magnet-related tools, resources and expertise is not only efficient and cost-effective, but also encourages fruitful, collaborative research at the highest level. Every year, more than 900 visiting scientists and engineers from across the world conduct experiments using our state-of-the-art equipment. Our magnets are far larger, far more powerful and far more complex than the everyday magnets most people are familiar with. Many were designed, developed and built by our magnet engineering and design team, widely recognized as the finest in the world. The Magnet Lab makes this remarkable science not just possible, but also accessible. Our doors are open to visitors, and our educational arm, the Center for Integrating Research and Learning, offers a variety of programs and resources to teachers and students at all academic levels. These efforts demonstrate our commitment to developing the next generation of science, engineering and education leaders.
View all literature mentionsFacility offers array of solid state, solution state, MRI/S (animal and human), MR microscopy and diffusion capabilities and techniques. Among their machines is 900 MHz 105 mm bore magnet. Techniques and instruments are available at two different MagLab facilities in Florida, NMR-MRI/S Facility at MagLab headquarters near Florida State University in Tallahassee and Advanced Magnetic Resonance Imaging and Spectroscopy Facility (AMRIS) housed within McKnight Brain Institute at University of Florida in Gainesville.
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