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Antiferromagnetic ordering in superconducting YBa2Cu3O6.5.
1Laboratoire Léon Brillouin, CEA-CNRS, CE Saclay, 91191 Gif sur Yvette, France.
Physical Review Letters
|May 1, 2001
Summary
Antiferromagnetic ordering coexists with superconductivity in YBa2Cu3O6.5. Magnetic fluctuations occur on a nanosecond timescale, suggesting an unusual spin density wave state.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- High-Tc cuprates are complex materials exhibiting superconductivity and magnetism.
- Understanding the interplay between these phenomena is crucial for developing new superconductors.
Purpose of the Study:
- To investigate the nature of antiferromagnetic ordering in the superconducting cuprate YBa2Cu3O6.5.
- To determine if magnetic ordering coexists with superconductivity and characterize its dynamics.
Main Methods:
- Polarized and unpolarized elastic neutron scattering to detect magnetic ordering.
- Zero-field muon-spin-resonance (µSR) to probe magnetic fluctuations on a nanosecond timescale.
Main Results:
- Commensurate antiferromagnetic ordering was observed in YBa2Cu3O6.5 (Tc = 55 K).
- Magnetic peak intensity significantly increased at the superconducting transition temperature (Tc).
- Muon-spin-resonance revealed dynamic magnetic fluctuations occurring on a nanosecond timescale.
Conclusions:
- The findings indicate a coexistence of antiferromagnetism and superconductivity in YBa2Cu3O6.5.
- The observed magnetic fluctuations suggest an unusual spin density wave (SDW) state.