高$T_c$超导体中的超流密度：空穴使能还是电子抑制？
Superfluid Density in High-$T_c$ Superconductors: Enabled by Holes or Suppressed by Electrons?
摘要：
欠掺杂铜氧化物超导体的临界温度受其相刚度$ρ$的限制。在这封信中，我们认为，$ρ$对掺杂$x$的依赖性应被理解为在大的电子密度与反铁磁性的有害竞争的结果，而不是作为证据配对的孔在$x =0$莫特绝缘体状态。我们的建议是基于这样的观察，即当反铁磁涨落很强时，d波超导体的相关能在有限配对波矢处增加。
英文摘要：
The critical temperature of an underdoped cuprate superconductor is limited by its phase stiffness $ρ$. In this Letter we argue that the dependence of $ρ$ on doping $x$ should be understood as a consequence of deleterious competition with antiferromagnetism at large electron densities, rather than as evidence for pairing of holes in the $x =0$ Mott insulator state. Our proposal is based on the observation that the correlation energy of a d-wave superconductor increases in magnitude at finite pairing wavevector when antiferromagnetic fluctuations are strong.
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