Analysis shows a strong correlation between magnetocrystalline anisotropy energy and upper critical fields in superconductors, suggesting implications for design.
We investigate the relationship between the magnetocrystalline anisotropy energy E^* and superconducting properties, specifically the upper critical field μ₀ Hc2, Pauli paramagnetic limit μ₀ HP, coherence length ξ, and penetration depth λ, in η- carbide-type oxide superconductors. Using reported data for Zr ₄ Pd ₂ O, Zr ₄ Rh ₂ O, and Ti ₄ Ir ₂ O, we calculate E^* along principal crystallographic directions and analyze its correlation with the enhancement Δ H = μ₀ Hc2 - μ₀ HP. Our results suggest a strong proportionality between E^* and Δ H, indicative of the role of spin-orbit coupling driven by anisotropy energy in violating the Pauli limit. Furthermore, we discuss how E^* influences superconducting coherence length and penetration depth, highlighting its importance in designing high-field oxide superconductors.
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Sudhakar Geruganti (2025) studied this question.
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