Abstract
'Overdoped' high-temperature superconductors, which have a high density of charge carriers, were thought to be well understood. An experiment challenges what we know about quantum physics in such systems. See Letter p.309 Ivan Božovic et al. present a comprehensive study of the key physical properties of the overdoped copper oxide superconductor La2−xSrxCuO4. Their results run counter to the common assumption that strongly correlated fermion physics evolves smoothly into conventional Bardeen–Cooper–Schrieffer (BCS) behaviour in overdoped copper oxide superconductors. Rather, in La2−xSrxCuO4 the scaling law for the critical superconducting temperature and zero-temperature phase stiffness does not conform to standard BCS physics. The authors speculate that the high critical temperature derives from local electron pairing and unusual kinematics.
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