2024/04/03 by Chris Halcrow, Halcrow, Chris, Ilya Shipulin +14 · 3 citations
Engineering · Physics and Astronomy · Chemistry · #Microfluidic and Capillary Electrophoresis Applications #Atomic and Subatomic Physics Research #Electrochemical Analysis and Applications
paper · pdf · doi:10.48550/arxiv.2404.03020
Experiments have pointed to the formation of the electron quadrupling condensate in Ba1-xKxFe2As2 at x ∼ 0.8. The state spontaneously breaks time-reversal symmetry and is sandwiched between two critical points, separating it from the broken time-reversal symmetry (BTRS) superconducting state at T\rm cU(1) and normal-metal state at T\rm c\rm Z2. We report a theory of the acoustic effects spectroscopy of systems with an electron quadrupling phase based on ultrasound-velocity measurements. We show that the experimental results are consistent with BTRS superconductivity at x ∼ 0.8, fulfilling the necessary condition for the formation of electron quadrupling in Ba1-xKxFe2As2. We provide the theoretical basis and the experimental strategy to study the order parameter symmetry of emerging quadrupling condensates in superconductors.