Observation of electronic bound states in charge-ordered YBa${}_2$Cu${}_3$O${}_y$

Abstract

Observing how electronic states in solids react to a local symmetry breaking provides insight into their microscopic nature. A striking example is the formation of bound states when quasiparticles are scattered off defects. This is known to occur, under specific circumstances, in some metals and superconductors but not, in general, in the charge-density-wave (CDW) state. Here, we report the unforeseen observation of bound states when a magnetic field quenches superconductivity and induces long-range CDW order in YBa${}_2$Cu${}_3$O${}_y$. Bound states indeed produce an inhomogeneous pattern of the local density of states $N(E_F)$ that leads to a skewed distribution of Knight shifts which is detected here through an asymmetric profile of ${}^{17}$O NMR lines. We argue that the effect arises most likely from scattering off defects in the CDW state, which provides a novel case of disorder-induced bound states in a condensed-matter system and an insightful window into charge ordering in the cuprates.

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• Unusual interplay between superconductivity and field-induced charge order in YBa2Cu3Oy
• Locally commensurate charge-density wave with three-unit-cell periodicity in YBCO
• Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field
• Nuclear Magnetic Resonance in High Magnetic Field: Application to Condensed Matter Physics
• NMR study of charge density waves under hydrostatic pressure in YBa2Cu3Oy
• Breaking the chains: extreme value statistics and localization in random spin chains
• Quasiparticle Density of States, Localization, and Distributed Disorder in the Cuprate Superconductors
• Structure of the Charge-Density Wave in Cuprate Superconductors: Lessons from NMR
• Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
• Impurity induced phase competition and supersolidity