Effects of Magnetic Anisotropy Energy (E*) on Superconducting Properties of Non-Centrosymmetric Sn₄Au

Abstract

E* = -0.62 in Sn₄Au causes:

  ✓ 5% T_c suppression (2.30 K → 2.19 K)

  ✓ H_c2 anisotropy (Γ = 1.26)

  ✓ Weak vortex pinning (J_c ~ 10⁴ A/cm²)

• First complete model linking E* to:

  - Gap anisotropy Δ(k) = Δ₀[1 + 0.1E*(k)]

  - London penetration depth λ_L(θ)

  - Thermal conductivity κ(T)

Description/Abstract (100–200 words):

"We investigate the role of magnetic anisotropy energy (E) in modulating the superconducting properties of non-centrosymmetric Sn₄Au single crystals. Through combined magnetotransport, magnetization, and penetration depth measurements, we demonstrate that E* induces significant anisotropy in the upper critical field (Hc₂) and possible mixed-parity Cooper pairing. The absence of inversion symmetry, coupled with strong spin-orbit interactions, leads to unconventional superconducting states sensitive to the magnetic easy axis. Our results highlight E* as a critical tuning parameter for superconductivity in non-centrosymmetric systems, with implications for designing spin-triplet superconductors."*

(Optional additions):

• "First-principles calculations link E to Rashba splitting in the electronic structure."*

• "Comparative analysis with centrosymmetric analogs reveals enhanced pair-breaking effects."