Spin polarised carrier injection into high Tc superconductor: A test for the superconductivity mechanism?

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We point out in this short communique, that be it a s-wave or d-wave superconductor, in a non equalibrium situation(i.e. in presence of excess unpolarised/polarised quasi-particles maintained by an injection current) the superconducting gap suppresion by the presence of same amount excess quasi-particles, can at best differ by a factor of 2, for a conventional BCS superconductor. For the high Tc superconductors on the other hand, there is a huge difference in gap suppresion between upolarised/polarised quasiparticle injection, as observed in the experimentsgold. We argue that this this large anomaly has a natural explanation within the Interleyer tunneling mechanism of Wheatley, Hsu and Andersonand, and is due to the excess polarised quasiparticles blocking the interlayer pair tunneling process. We also point out that spin polarised quasi-particle injection in a superconductor is a very easy way to distinguish between a s-wave or an anisotropic gap superconductor.