论文标题
超级铜中的超晶密度：薄膜与散装样品
Superuid density in overdoped cuprates: thin films versus bulk samples
论文作者
论文摘要
最近对BoWisović{\ it等人的蛋白质Cuo $ _4 $ _x $ _4 $ _x $ _x $ _x $ _x $ _x $ _x $ _x $ _x $ _x $ _x $ _ $ _ $ _ $ _ $ _ {\ iT等}的最新研究揭示了几个意外的发现，最值得注意的是，违反了充分描述的蛋白质。特别是，发现LA $ _ {2-x} $ sr $ _x $ cuo $ _4 $胶片的超氟密度在超级温度t $ _C $的线性功能上降低了，这被视为违反房屋法律的证据。我们明确地表明，法律确实受到了侵犯，作为违反的主要原因，我们发现Božović电影中的超流体密度比在散装样本中更强烈地被抑制。根据现有的文献数据，我们表明，散装库酸酯样品中的超流体密度不会随着掺杂而降低，而是倾向于在过度的一侧饱和。我们最近对重量超过的散装la $ _ {2-x} $ sr $ _x $ cuo $ _4 $样本的测量也支持了结果。此外，这种超流体密度的饱和度可能不限于丘比特，因为我们发现了两个Pnictide超导体家族中类似行为的证据。我们认为，量子相波动在抑制薄膜中的超流体密度方面起着重要作用。
Recent study of overdoped La$_{2-x}$Sr$_x$CuO$_4$ cuprate superconductor thin films by Božović {\it et al.} has revealed several unexpected findings, most notably the violation of the BCS description which was believed to adequately describe overdoped cuprates. In particular, it was found that the superfluid density in La$_{2-x}$Sr$_x$CuO$_4$ films decreases on the overdoped side as a linear function of critical temperature T$_c$, which was taken as evidence for the violation of the Homes' law. We show explicitly that the law is indeed violated, and as the main reason for violation we find that the superfluid density in Božović's films is suppressed more strongly than in bulk samples. Based on the existing literature data, we show that the superfluid density in bulk cuprate samples does not decrease with doping, but instead tends to saturate on the overdoped side. The result is also supported by our recent measurement of a heavily overdoped bulk La$_{2-x}$Sr$_x$CuO$_4$ sample. Moreover, this saturation of superfluid density might not be limited to cuprates, as we find evidence for similar behavior in two pnictide superconductor families. We argue that quantum phase fluctuations play an important role in suppressing the superfluid density in thin films.
