AI Article Synopsis
- The study uses NMR to observe a unique distribution of ^{17}O Knight shifts in YBa_{2}Cu_{3}O_{y} when superconductivity is disrupted by a magnetic field, leading to long-range charge-density-wave (CDW) order.
- This distribution is attributed to an uneven local density of states caused by quasiparticle scattering off unidentified defects within the CDW state.
- The results suggest a connection to quasiparticle bound states that can occur in certain metals and superconductors, highlighting the complex interactions within CDW materials and their sensitivity to disorder.
Article Abstract
We report the NMR observation of a skewed distribution of ^{17}O Knight shifts when a magnetic field quenches superconductivity and induces long-range charge-density-wave (CDW) order in YBa_{2}Cu_{3}O_{y}. This distribution is explained by an inhomogeneous pattern of the local density of states N(E_{F}) arising from quasiparticle scattering off, yet unidentified, defects in the CDW state. We argue that the effect is most likely related to the formation of quasiparticle bound states, as is known to occur, under specific circumstances, in some metals and superconductors (but not in the CDW state, in general, except for very few cases in 1D materials). These observations should provide insight into the microscopic nature of the CDW, especially regarding the reconstructed band structure and the sensitivity to disorder.
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| http://dx.doi.org/10.1103/PhysRevLett.118.017001 | DOI Listing |
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