Magnetic anisotropy in Shiba bound states across a quantum phase transition

Abstract

The exchange coupling between magnetic adsorbates and a superconducting substrate leads to Shiba states inside the superconducting energy gap and a Kondo resonance outside the gap. The exchange coupling strength determines whether the quantum many-body ground state is a Kondo singlet or a singlet of the paired superconducting quasiparticles. Here, we use scanning tunneling spectroscopy to identify the different quantum ground states of Manganese phthalocyanine on Pb(111). We observe Shiba states, which are split into triplets by magnetocrystalline anisotropy. Their characteristic spectral weight yields an unambiguous proof of the nature of the quantum ground state.

6 pages, 4 figures

References in corpus (6)

• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Experimental demonstration of a two-band superconducting state for lead using scanning tunneling spectroscopy
• Magnetic anisotropy effects on quantum impurities in superconducting host
• Microscopic resolution of the interplay of Kondo screening and superconducting pairing: Mn-phthalocyanine molecules adsorbed on superconducting Pb(111)
• Impurity-induced bound states in superconductors with spin-orbit coupling
• Vibrational Andreev bound states in magnetic molecules

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