Spectroscopic Evidence for Anisotropic S-Wave Pairing Symmetry in MgB2
Seneor, P. · Chen, C. -T. · Yeh, N. -C. · Vasquez, R. P. · Bell, L. D. · Jung, C. U. · Park, Min-Seok · Kim, Heon-Jung · Kang, W. N. · Lee, Sung-Ik
الأصل · EN
Scanning tunneling spectroscopy of superconducting MgB₂ (Tc = 39 K) were studied on high-density pellets and c-axis oriented films. The sample surfaces were chemically etched to remove surface carbonates and hydroxides, and the data were compared with calculated spectra for all symmetry-allowed pairing channels. The pairing potential (Δₖ) is best described by an anisotropic s-wave pairing model, with Δₖ = Δxy ² θₖ + Δz ² θₖ, where θₖ is the angle relative to the crystalline c-axis, Δz 8.0 meV, and Δxy 5.0 meV.
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