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Bulletin of the American Physical Society

Singular Density Fluctuations in the Strange Metal Phase of a Copper-Oxide Superconductor

Ali Husain, Matteo Mitrano, Sean Vig, Anshul Kogar, Melinda Rak, Samantha Rubeck, Jörg Schmalian, Bruno Uchoa, John A. Schneeloch, Ruidan Zhong, Genda D. Gu, Peter M. Abbamonte

Published Mar 6, 2018• 0 citations
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In order to investigate possible nonphonon mechanisms for superconductivity in the copper oxide compounds, the two-dimensional Hubbard model is studied in the weak-coupling limit. A scaling theory is developed which allows a consistent treatment of the coupled ln 2 ( T )-singularities arising from density wave and Cooper pairing fluctuations. For a half-filled band a spin-density-wave (antiferromagnetic) phase transition occurs, whereas for small deviations from half-filling spin fluctuations lead to a d -type superconducting phase. The method generalizes straightforwardly to finite-range interactions. The possible relevance to oxide superconductors and experimental tests are briefly discussed.