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Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates.
Guarise, M; Dalla Piazza, B; Berger, H; Giannini, E; Schmitt, T; Rønnow, H M; Sawatzky, G A; van den Brink, J; Altenfeld, D; Eremin, I; Grioni, M.
Afiliación
  • Guarise M; Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
  • Dalla Piazza B; Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
  • Berger H; Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
  • Giannini E; Département de Physique de la Matière Condensée, Université de Genève, 24 Quai Ernest-Ansermet, 1211 Geneva, Switzerland.
  • Schmitt T; Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
  • Rønnow HM; 1] Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland [2] RIKEN Centre for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
  • Sawatzky GA; Department of Physics &Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1.
  • van den Brink J; Institute for Theoretical Solid State Physics, IFW Dresden, D01171 Dresden, Germany.
  • Altenfeld D; Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany.
  • Eremin I; 1] Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44801 Bochum, Germany [2] National University of Science and Technology 'MISiS', Moscow 119049, Russian Federation.
  • Grioni M; Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
Nat Commun ; 5: 5760, 2014 Dec 18.
Article en En | MEDLINE | ID: mdl-25519803
The high-Tc cuprate superconductors are close to antiferromagnetic order. Recent measurements of magnetic excitations have reported an intriguing similarity to the spin waves--magnons--of the antiferromagnetic insulating parent compounds, suggesting that magnons may survive in damped, broadened form throughout the phase diagram. Here we show by resonant inelastic X-ray scattering on Bi(2)Sr(2)CaCu(2)O(8+δ) (Bi-2212) that the analogy with spin waves is only partial. The magnon-like features collapse along the nodal direction in momentum space and exhibit a photon energy dependence markedly different from the Mott-insulating case. These observations can be naturally described by the continuum of charge and spin excitations of correlated electrons. The persistence of damped magnons could favour scenarios for superconductivity built from quasiparticles coupled to spin fluctuations. However, excitation spectra composed of particle-hole excitations suggest that superconductivity emerges from a coherent treatment of electronic spin and charge in the form of quasiparticles with very strong magnetic correlations.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2014 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nat Commun Asunto de la revista: BIOLOGIA / CIENCIA Año: 2014 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Reino Unido