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 YBa
2
Cu
3
O
6+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 2
0
stays almost unchanged. The results are in reasonable agreement with inelastic neutronscattering experiments. |
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Keywords: | |
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