Energy Scales in the Local Magnetic Excitation Spectrum of YBa2Cu3O6+y |
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Authors: | Jan Brinckmann Patrick A. Lee |
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Affiliation: | (1) Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany;(2) Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139 |
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Abstract: | The wave-vector integrated dynamical spin susceptibility 2D() of YBa2Cu3O6+y cuprates is considered. 2D is calculated in the superconducting state from a renormalized mean-field theory of the t–t–J-model, based on the slave-boson formulation. Besides the well-known 41 meV resonance a second, much broader peak ('hump') appears in Im 2D. It is caused by particle-hole excitations across the maximum gap 0. In contrast to the resonance, which moves to lower energies when the hole filling is reduced from optimal doping, the position of this 'hump' at 20 stays almost unchanged. The results are in reasonable agreement with inelastic neutronscattering experiments. |
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