London Penetration Depth as a Test of Order Parameter Symmetry in Sodium Cobaltate Superconductors

Dmitry M. Dzebisashvili, Andrey B. Klyuchantsev
2019 Symmetry  
Temperature dependence of the magnetic field penetration depth λ was calculated for water intercalated sodium cobaltate superconductor Na x CoO 2 · y H 2 O. Assuming that the system is in the chiral d+id–wave superconducting state, it was shown that the shifting of the excitation spectrum nodal points off the normal phase Fermi surface due to variation of the sodium content x changes the functional form of the temperature dependence of λ − 2 from exponential to linear in the low temperatures
more » ... ion. It is argued that this change in the functional form of T–dependence of the λ − 2 can serve as a proof for the chiral symmetry of the superconducting order parameter in the sodium cobaltate.
doi:10.3390/sym11050633 fatcat:4jhhwevdgbf3rplam6lvalesfm