Magnetic field first kills superconductor, then brings it back to life
“Re-entrant” superconductivity discovered in a 2D material for the first time The post Magnetic field first kills superconductor, then brings it back to life appeared first on Physics World .
An international team of physicists has observed a previously unseen phenomenon in an unconventional two-dimensional superconductor, where the magnetic field first destroys the superconductivity and then brings it back to life. This re-entrant superconductivity (RSC) was discovered in LaTiO3/ KTaO3 heterostructures by a collaboration between Japan’s RIKEN Center for Emergent Matter Science and researchers from Germany, Austria, Poland, and Spain.
The magnetic ordering caused by the ferromagnetic ordering initially suppresses superconductivity, but when the magnetic field is further increased, superconductivity reappears. The researchers found a minimum in the critical temperature (Tc) as a function of the applied magnetic field (B), which they attributed to a balance between the reduction in Cooper pairing efficiency due to the breaking of the electron momentum symmetry and the increase in Cooper pairing efficiency caused by the shift of electrons towards the Van Hove singularity.
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