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An explanation for a universality of transition temperatures in families of copper oxide superconductors

Abstract

A remarkable mystery of the copper oxide high-transition-temperature (Tc) superconductors is the dependence of Tc on the number of CuO2 layers, n, in the unit cell of a crystal. In a given family of these superconductors, Tc rises with the number of layers, reaching a peak at n = 3, and then declines1: the result is a bell-shaped curve. Despite the ubiquity of this phenomenon, it is still poorly understood and attention has instead been mainly focused on the properties of a single CuO2 plane. Here we show that the quantum tunnelling of Cooper pairs between the layers2 simply and naturally explains the experimental results, when combined with the recently quantified charge imbalance of the layers3 and the latest notion of a competing order4,5,6,7,8,9 nucleated by this charge imbalance that suppresses superconductivity. We calculate the bell-shaped curve and show that, if materials can be engineered so as to minimize the charge imbalance as n increases, Tc can be raised further.

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Figure 1: Transition temperature within a homologous series.
Figure 2: The T = 0 phase diagram of a one-layer copper oxide as a function of doping, x.
Figure 3: The calculated superconducting order parameters at T = 0 of multilayer copper oxides.

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Acknowledgements

We thank the Aspen Centre for Physics, where this collaboration was initiated, and also N. P. Armitage and J. Hoffman for discussions. We acknowledge support from the US National Science Foundation (S.C.), the Canadian Institute for Advanced Research (H.-Y.K. and K.V.), and the Alfred P. Sloan Foundation (H.-Y.K.).

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Correspondence to Sudip Chakravarty.

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Chakravarty, S., Kee, HY. & Völker, K. An explanation for a universality of transition temperatures in families of copper oxide superconductors. Nature 428, 53–55 (2004). https://doi.org/10.1038/nature02348

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