高Tc铜氧化物超导体中的同位素效应：双极化子超导理论的最终证明
Isotope effects in high-Tc cuprate superconductors: Ultimate proof for bipolaron theory of superconductivity
摘要：
铜氧化物高温超导理论的发展是物理学中的突出问题之一。发现25年后，尽管在理论和实验上做出了巨大的努力，但仍然没有就微观理论达成共识。试图理解这个问题是阻碍了一些机制之间的微妙的相互作用，并在这些系统中存在几个几乎退化和竞争的阶段。在这里，我们提供了统一的无参数的解释所观察到的氧同位素效应的临界温度，磁场穿透深度，和正常状态的赝隙欠掺杂的铜氧化物超导体的双极化子理论的框架内兼容的强库仑和Froehlich相互作用，并与许多其他独立的意见，在这些高度极化的掺杂绝缘体。值得注意的是，我们还定量地解释测得的临界温度和磁场穿透深度的大小。因此，目前的工作代表了高温超导的双极化子理论的最终证明，其中考虑到基本的库仑和电子-声子相互作用。
英文摘要：
Developing a theory of high-temperature superconductivity in copper oxides is one of the outstanding problems in physics. Twenty-five years after its discovery, no consensus on the microscopic theory has been reached despite tremendous theoretical and experimental efforts. Attempts to understand this problem are hindered by the subtle interplay among a few mechanisms and the presence of several nearly degenerate and competing phases in these systems. Here we provide unified parameter-free explanation of the observed oxygen-isotope effects on the critical temperature, the magnetic-field penetration depth, and on the normal-state pseudogap for underdoped cuprate superconductors within the framework of the bipolaron theory compatible with the strong Coulomb and Froehlich interactions, and with many other independent observations in these highly polarizable doped insulators. Remarkably, we also quantitatively explain measured critical temperatures and magnitudes of the magnetic-field penetration depth. The present work thus represents an ultimate proof of the bipolaron theory of high-temperature superconductivity, which takes into account essential Coulomb and electron-phonon interactions.
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