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Letter

Nature Physics 2, 600–604 (1 September 2006) | doi:10.1038/nphys394

Magnetic energy change available to superconducting condensation in optimally doped YBa2Cu3O6.95

Hyungje Woo , Pengcheng Dai , S. M. Hayden , H. A. Mook , T. Dahm , D. J. Scalapino , T.|[nbsp]|G. Perring & F. Do|[gbreve]|an

Understanding the magnetic excitations in high-temperature (high-Tc) copper-oxide superconductors is important because they may mediate the electron pairing for superconductivity. By determining the wavevector (Q) and energy (|[hstrok]||[omega]|) dependence of the magnetic excitations, it is possible to calculate the change in the exchange energy available to the superconducting condensation energy.