This analysis reveals the link between anisotropy energy and superconducting properties in Zr₄Pd₂O, suggesting a novel framework for understanding high-field behavior.
The η-carbide-type oxide superconductor Zr₄Pd₂O exhibits unconventional superconducting behavior characterized by an enhanced upper critical field μ₀ Hc2 that exceeds the Pauli paramagnetic limit. In this paper, we establish a quantitative relation between the directional anisotropy energy E^*, arising from spin-orbit coupling (SOC) and crystal anisotropy, and the superconducting properties of Zr₄Pd₂O. We demonstrate how E^* influences SOC strength, suppresses Pauli paramagnetic pair-breaking, and leads to enhancement of μ₀ Hc2. The derived expression provides a mechanistic framework to understand the robustness of superconductivity in Zr₄Pd₂O under high magnetic fields.
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Sudhakar Geruganti (2025) studied this question.
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