A magnetic analog of the isotope effect in cuprates
Since the discovery of high temperature superconductivity in the cuprates, it has been speculated that their pairing mechanism is due to magnetic interactions. However, this was never demonstrated in the laboratory. Such a demonstration would require an experiment similar to the isotope effect in metallic superconductors, namely, a measurement of Tc versus the strength of the magnetic coupling J, with no other structural changes. We are proposing to do this experiment using the (Ca_xLa_{1-x})(Ba_{1.75-x}La_{0.25+x})Cu_3O_y system with its 4 different families having different T_c^max, but identical structures. J should be measured with inelastic neutron scattering on IN8 and compared with Tc^max. Preliminary results show that the experiment is doable. However, the proposal is submitted as a new one due to scheduling problems.
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KEREN Amit; DRACHUCK Gil; KAPON Itzik and WILDES Andrew. (2014). A magnetic analog of the isotope effect in cuprates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1288
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