论文标题
LSCO中超导性的逐渐出现
Gradual emergence of superconductivity in underdoped LSCO
论文作者
论文摘要
我们介绍了在强大的la $ _ {2-x} $ _ {2-x} $ sr $ _ {x} $ cuo $ _ {4} $的三轴中子散射研究中，$ _ {4} $，$ x = 0.05 $，$ 0.06 $，$ 0.06 $和$ 0.07 $，提供定量的竞争和这些范围的竞争。在兴奋剂上$ x = 0.06 $和$ x = 0.07 $，发现三维超导率，而仅在Cuo $ _2 $ _2 $ _2 $ _2 $ _2 $的二维超导率的非常弱的签名中可以检测到$ x = 0.05 $。我们发现，在所有三个掺杂物中，外部磁场对低能波动的抑制令人惊讶。这意味着二维超导对磁场的响应类似于散装超导体的响应。我们的结果提供了直接证据，表明丘比特人非常逐渐发作。
We present triple-axis neutron scattering studies of low-energy magnetic fluctuations in strongly underdoped La$_{2-x}$Sr$_{x}$CuO$_{4}$ with $x=0.05$, $0.06$ and $0.07$, providing quantitative evidence for a direct competition between these fluctuations and superconductivity. At dopings $x=0.06$ and $x=0.07$, three-dimensional superconductivity is found, while only a very weak signature of two-dimensional superconductivity residing in the CuO$_2$ planes is detectable for $x=0.05$. We find a surprising suppression of the low-energy fluctuations by an external magnetic field at all three dopings. This implies that the response of two-dimensional superconductivity to a magnetic field is similar to that of a bulk superconductor. Our results provide direct evidence of a very gradual onset of superconductivity in cuprates.
