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Glass-induced enhancement of superconducting T_c: Pairing via dissipative mediators

机译：玻璃诱导的超导T_c增强：通过耗散介体配对

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With substantial evidence of glassy behavior in the phase diagram of high-T-c superconductors and its coexistence with superconductivity, we attempt to answer the following question: what are the properties of a superconducting state where the force driving Cooper pairing becomes dissipative? We find that when the bosonic mediator is local, dissipation acts to reduce the superconducting critical temperature (T-c). On the other hand, contrary to naive expectations, T-c behaves nonmonotonically with dissipation for a nonlocal mediator-weakly dissipative bosons at different energy scales act coherently to give rise to an increase in T-c and eventually destroy superconductivity when the dissipation exceeds a critical value. The critical value occurs when dissipative effects become comparable to the energy scale associated with the spatial stiffness of the mediator, at which point T-c acquires a maximum. We outline consequences of our results to recent proton-irradiation experiments (M. Leroux et al., arXiv:1808.05984) on the cuprate superconductor La2-xBaxCuO4 (LBCO), which observe a disorder-induced increase in T-c even when the transition temperature of the proximate charge density wave (CDW) seems to be unaffected by irradiation. Our mechanism is a way to raise T-c that does not require a "tug-of-war" type scenario between two competing phases.
机译：有了高T-c超导体相图中玻璃态行为的充分证据，以及它与超导性的共存，我们尝试回答以下问题：驱动库珀配对的力消散的超导状态的性质是什么？我们发现当玻色子介体处于局部时，耗散会降低超导临界温度（T-c）。另一方面，与幼稚的期望相反，T-c表现为具有耗散的非单调行为，因为不同能级的非局部介导的弱耗散玻色子相干地引起T-c的增加，并在耗散超过临界值时破坏超导性。当耗散效应变得与与介体的空间刚度相关的能级可比时，临界值就会出现，此时T-c达到最大值。我们概述了我们的结果对最近对铜酸盐超导体La2-xBaxCuO4（LBCO）进行质子辐照实验（M. Leroux等，arXiv：1808.05984）的结果，该观察结果表明，即使当转变温度为接近的电荷密度波（CDW）似乎不受辐射的影响。我们的机制是一种提高T-c的方法，在两个竞争阶段之间不需要“拔河”式的情况。

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  • 来源
    《Physical review》 |2019年第14期|144523.1-144523.6|共6页
  • 作者

    Setty Chandan;

  • 作者单位

    Univ Florida, Dept Phys, Gainesville, FL 32611 USA;

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