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Antiferromagnetic correlations and impurity broadening of NMR linewidths in cuprate superconductors

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [3];  [4]
  1. University of Florida, Gainesville, FL (United States)
  2. University of Florida, Gainesville, FL (United States); Laboratoire de Physique Quantique, Paris (France)
  3. Université Paris-Sud (France)
  4. University of Florida, Gainesville, FL (United States); Université Paris-Sud (France)

We study a model of a d-wave superconductor with strong potential scatterers in the presence of antiferromagnetic correlations and apply it to experimental nuclear magnetic resonance (NMR) results on Zn impurities in the superconducting state of Y⁢Ba2⁢Cu3⁢O7–δ. We then focus on the contribution of impurity-induced paramagnetic moments, with Hubbard correlations in the host system accounted for in Hartree approximation. We show that local magnetism around individual impurities broadens the line, but quasiparticle interference between impurity states plays an important role in smearing out impurity satellite peaks. The model, together with estimates of vortex lattice effects, provides a semiquantitative description of the impurity concentration dependence of the NMR line shape in the superconducting state, and gives a qualitative description of the temperature dependence of the line asymmetry. Here, we argue that impurity-induced paramagnetism and resonant local density of states effects are both necessary to explain existing experiments.

Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER46236
OSTI ID:
2480897
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 5 Vol. 75; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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