Phys.org March 4, 2019 Under normal electron band theory, Mott insulators ought to conduct electricity, but they do not due to interactions among their electrons. An international team of researchers (Japan, Italy) used numerical methods to show that pulses of light could be used to turn these materials beyond simple conductors to superconductors due to an unconventional type of superconductivity known as “eta pairing” which is thought to involve repulsive interactions between certain electrons within the structure. The research provides new insights not only into the phenomenon of non-equilibrium dynamics but could lead to the development of new high-temperature superconductors…read […]
Category Archives: Superconductivity
Physicists uncover new competing state of matter in superconducting material
Science Daily January 2, 2019 Using ultrafast terahertz pump-probe a team of researchers in the US (Iowa State University, University of Alabama) found an unusual out-of-equilibrium Cooper pair nonlinear dynamics and a nonequilibrium state in iron pnictides. They identified long prebottleneck dynamics that are sensitive to both doping and temperature. According to the researchers the buildup of excitonic interpocket correlation between electron-hole quasiparticles quenches superconductivity after photoexcitation leading to a long-lived, many-quasiparticle excitonic state. Findings help create better superconducting electronics and energy-efficient devices…read more. TECHNICAL ARTICLE
Graphene on the way to superconductivity
Science Daily November 9, 2018 Previously researchers at MIT showed that it is possible to generate a form of superconductivity in a system of two layers of graphene under very specific conditions using a complex method. Researchers in Germany have developed a simpler technique by heating silicon carbide crystal until silicon atoms evaporate from the surface, leaving first a single-layer of graphene on the surface, and then a second layer of graphene. The two graphene layers are not twisted against each other but lie exactly on top of each other. They argue that their two-dimensional flat band model and the […]
Superconductivity above 10 K in a novel quasi-one-dimensional compound
Phys.org August 13, 2018 Researchers in China succeeded in synthesizing the new Q1D K2Mo3As3 compound whose Tc value exceeded 10 K. Bulk superconductivity below 10.4 K was confirmed by electrical resistivity, magnetic susceptibility, and heat capacity measurements. The K2Mo3As3 is the first MoAs-based superconductor and possesses the record Tc in all Q1D superconductors. This discovery indicates that Cr and Mo based Q1D superconductors may share some common underlying origins within the similar structural motifs and will help to uncover the exotic superconducting mechanism in low dimensional materials… read more. Open Access TECHNICAL ARTICLE