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

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 poin...

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Bibliographic Details
Published in:Symmetry (Basel) 2019-05, Vol.11 (5), p.633
Main Authors: Dzebisashvili, Dmitry M., Klyuchantsev, Andrey B.
Format: Article
Language:English
Subjects:
Approximation
chiral order parameter
Excitation spectra
Fermi surfaces
London penetration depth
Low temperature
Magnetic field penetration depth
Magnetic fields
Mathematical analysis
Order parameters
Penetration depth
Sodium
sodium cobaltate superconductor
Superconductivity
Superconductors
Symmetry
Temperature dependence
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Summary: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 region. 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.
ISSN:2073-8994
2073-8994
DOI:10.3390/sym11050633