论文标题
Untwinned YBA $ _2 $ cu $ _3 $ o $ $ _ {7-δ} $薄膜的掺杂依赖性
Doping dependence of the upper critical field in untwinned YBa$_2$Cu$_3$O$_{7-δ}$ thin films
论文作者
论文摘要
我们报告了50 nm厚的yba $ _2 $ _2 $ _3 $ _3 $ o $ $ _ {7-δ} $ films的掺杂依赖性的测量值。这些薄膜未受关注，其特征是平面内压缩应变。我们发现$ h_ {c，2} $在相图的被压缩区域显示出强大的减小，这与在放松的单晶中测量的相一致。在电荷密度波订单与超导性竞争的情况下，讨论了$ H_ {C，2} $减少的起源。这证明了使用薄膜来研究应变下的高$ t_c $材料的相图。
We report on measurements of the doping dependence of the upper critical field $H_{c,2}$ in 50 nm thick YBa$_2$Cu$_3$O$_{7-δ}$ films. The films are untwinned and are characterized by a small in-plane compressive strain. We find that the $H_{c,2}$ shows a strong decrease in the underdoped region of the phase diagram, in agreement with what has been measured in relaxed single crystals. The origin of the decrease of $H_{c,2}$ in the underdoped regime is discussed within a scenario where charge density wave order competes with superconductivity. This demonstrates the potential of using thin films for studying the phase diagram of high-$T_c$ materials under strain.
