The resonant magnetic mode : a common feature of high - T C superconductors
نویسنده
چکیده
Inelastic neutron scattering experiments in high-Tc cuprates have evidenced a new magnetic excitation present in the superconducting state. In particular, recent experiments on single layer Tl2Ba2CuO6+δ, performed near optimum doping (Tc ∼ 90 K), provide evidence of a sharp magnetic resonant mode below Tc, similar to previous reports on the YBCO and BSCCO bilayer systems. This result supports models that ascribe a key role to magnetic excitations in the mechanism of superconductivity.
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The recently discovered MgB2 superconductors have a record transition temperature for a BCS superconductor due to the high vibration frequencies associated with its light elements. The transition temperatures in the cuprate family of superconductors are much higher but these do not fit the BCS paradigm. The most promising microscopic origin for their many anomalous properties lies in magnetic...
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