Defects in correlated metals and superconductors
By H. Alloul, J. Bobroff, M. Gabay, P. Hirschfeld. 2007
311 citations recorded by the source corpus.
In materials with strong local Coulomb interactions, simple defects such as atomic substitutions strongly affect both macroscopic and local properties of the system. A nonmagnetic impurity, for instance, is seen to induce magnetism nearby. Even without disorder, models of such correlated systems are generally not soluble in 2 or 3 dimensions, and so few exact results are known for the properties of such impurities. Nevertheless, some simple physical ideas have emerged from experiments and approximate theories. Here, we first review what we can learn about this problem from 1D antiferromagnetically correlated systems. We then discuss experiments on the high Tc cuprate normal state which probe the effect of impurities on local charge and spin degrees of freedom, and compare with theories of single impurities in correlated hosts, as well as phenomenological effective Kondo descriptions. Subsequently, we review theories of impurities in d-wave superconductors including residual quasiparticle interactions, and compare with experiments in the superconducting state. We argue that existing data exhibit a remarkable similarity to impurity-induced magnetism in the 1D case, implying the importance of electronic correlations for the understanding of these phenomena, and suggesting that impurities may provide excellent probes of the still poorly understood ground state of the cuprates.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/3a3fe1cb572195bffd7de50311de3219a62557c7
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Citations in the corpus
- Progress and perspectives on electron-doped cuprates (2009, methodology): “Despite an almost unprecedented material science effort, the origin of the superconductivity or indeed even much consensus on their dominate physics remains elusive(Alloul et al., 2009; Campuzano et al., 2004; Damas- ar X iv :0 90 6.”
- Electrodynamics of correlated electron materials (2011, background): “…although their fingerprints become observable at some point.19 The superconducting state of cuprates is known to be very sensitive to Zn impurities (Alloul et al., 2009; 19 Although most of the theoretical was done in the 1980s (Belitz and Götze, 1981; Belitz and Kirkpatrick, 1994; Evers and…”