Robustness of quantum critical pairing against disorder

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    UNCONVENTIONAL SUPERCONDUCTORS;    CRITICAL-POINT;    STATE;    SUPPRESSION;    SYMMETRY;    METALS;    INSTABILITY;    IMPURITIES;    DEFECTS;   

DOI  :  10.1103/PhysRevB.93.224514

来源: SCIE

【 摘 要 】

The remarkable robustness of high-temperature superconductors against disorder remains a controversial obstacle towards the elucidation of their pairing state. Indeed, experiments report a weak suppression rate of the transition temperature T-c with disorder, significantly smaller than the universal value predicted by extensions of the conventional theory of dirty superconductors. However, in many high-T-c compounds, superconductivity appears near a putative magnetic quantum critical point, suggesting that quantum fluctuations, which suppress coherent electronic spectral weight, may also promote unconventional pairing. Here we investigate theoretically the impact of disorder on such a quantum critical pairing state, considering the coupling of impurities both to the low-energy electronic states and to the pairing interaction itself. We find a significant reduction in the suppression rate of T-c with disorder near the magnetic quantum critical point, shedding new light on the nature of unconventional superconductivity in correlated materials.

【 授权许可】

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