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The electronic dispersion for Bi2Sr2CaCu2O(8+d) has been determined fromangle-resolved photoelectron spectroscopy (ARPES). From this dispersion wecalculate the entropy and superfluid density. Even with no adjustableparameters we obtain an exceptional match with experimental data across theentire phase diagram, thus indirectly confirming both the ARPES andthermodynamic data. The van Hove singularity is crossed in the overdoped regiongiving a distinctive linear-in-T temperature dependence in the superfluiddensity there.

Thermodynamic properties of Bi2Sr2CaCu2O8 calculated from the electronic dispersion