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The thermopower S of the high-Tc superconductor La(1.6-x)Nd(0.4)Sr(x)CuO(4)was measured as a function of temperature T near its pseudogap critical point,the critical hole doping p* where the pseudogap temperature T* goes to zero.Just above p*, S/T varies as ln(1/T) over a decade of temperature. Below p*,S/T undergoes a large increase below T*. As with the temperature dependence ofthe resistivity, which is linear just above p* and undergoes a large upturnbelow T*, these are typical signatures of a quantum phase transition. Thissuggests that p* is a quantum critical point below which some order sets in,causing a reconstruction of the Fermi surface, whose fluctuations arepresumably responsible for the linear-T resistivity and logarithmicthermopower. We discuss the possibility that this order is the "stripe" orderknown to exist in this material.

physical review. b, condensed matter and materials physics

Thermopower across the pseudogap critical point of  La(1.6-x)Nd(0.4)Sr(x)CuO(4): Evidence for a quantum critical point in a  hole-doped high-Tc superconductor