Manipulating atoms to make better superconductors

Science Daily  March 3, 2020 The creation of collective behavior is the fundamental building block from which superconductivity emerges. A team of researchers in the US (University of Illinois at Chicago, SLAC National Accelerator Laboratory, Stanford University) had theoretically predicted in a Kondo droplet, for certain distances between the cobalt atoms, the nanoscopic system should start to exhibit collective behavior, while for other distances, it should not. They confirmed the predictions by experiments that showed that collective behavior appears in Kondo droplets containing as little as 37 cobalt atoms. It allows us to move one step closer to developing the […]

Electronic map reveals ‘rules of the road’ in superconductor

Science Daily  December 6, 2019 An international team of researchers (USA – Rice University, UC Berkeley, SLAC National Accelerator Laboratory, Lawrence Berkeley National Laboratory, Stanford University, China) has developed a band structure map from the data gathered from measurements of a single crystal of iron selenide as it was cooled to the point of superconductivity. They are making observations of different types of exotic materials and figuring out the quantum mechanical rules that govern electron behavior in those materials. The electronic structure helps deciding if a material will be a good conductor or a good insulator or a superconductor…read more. […]

Finding the ‘magic angle’ to create a new superconductor

Science Daily  October 2, 2019 Earlier this year, scientists at MIT reported that graphene could become a superconductor if one piece of graphene were laid on top of another piece and the layers twisted to a specific angle , they called “the magic angle” of between 1 degree and 1.2 degrees. Now an international team of researchers (USA – Ohio State University, TT Dallas, Japan) found that graphene layers still superconducted at a smaller angle, around 0.9 degrees. It is a small distinction, but the findings provide a wealth of new information to help decipher the strongly correlated phenomena observed […]

Making new layered superconductors using high entropy alloys

Science Daily   May 4, 2018 Use of layered materials with a molecular structure consisting of alternating superconducting layers and “blocking layers” acting as insulating spacers is used to design new superconductors that retain superconducting properties at higher temperatures. Researchers in Japan have created new superconductors made of layers of bismuth sulfide and a high entropy rare earth alloy oxyfluoride, containing five rare earth elements – lanthanum, cerium, praseodymium, neodymium, and samarium – at the same crystallographic site. The new material retains superconducting properties over a wider range of lattice parameters than materials without high-entropy-alloy states. The work promises a new […]