Superconducting ground states

Below, we present the results of applying the methodology of the ECM, described in section 2, to the calculation of the superconducting ground state of the YBa2Cu307... 

This is not to say that the t-J model has a superconducting ground state above some x. As Anderson et al. point out, numerical evidence on this issue is divided. But, from the perspective of a theory of the cuprate phenomena this issue is incidental. Even if the ground state of the t-J model were to be superconducting, it cannot be a model for the Cuprates unless it can give a phase diagram similar to Fig. (3). 

We report here the synthesis and electronic transport measurements of high-quality single crystals of KsCfio Measurements of the dc electrical resiatlvlty p(T) show an intrinsic metal-like temperature dependence below room tempemture, with an extremely sharp transition to the superconducting ground state at 19.8 K no evidence is found for strong fluctuation effects near T. These results are in sharp contrast to the behavior of polycrystalline and thin film samples. 

URu3 is weakly paramagnetic with a superconducting ground state and Tc = 0.15 K (Chen et al. 1985, Ott et al. 1985a). Superconductivity is suppressed by replacing... 

Thlr3 is a weak paramagnet (Brodsky 1980) with a superconducting ground state (Huber 1986). 

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