Disorder raises the critical temperature of a cuprate superconductor. 2018. Paper abstract bibtex With the discovery of charge density waves (CDW) in most members of the cuprate high temperature superconductors, the interplay between superconductivity and CDW has become a key point in the debate on the origin of high temperature superconductivity. Some experiments in cuprates point toward a CDW state competing with superconductivity, but others raise the possibility of a CDW-superconductivity intertwined order, or more elusive pair-density wave (PDW). Here we have used proton irradiation to induce disorder in crystals of La\$_1.875\$Ba\$_0.125\$CuO\$_4\$ and observed a striking 50% increase of \$T_{\textbackslash}mathrmc\$ accompanied by a suppression of the CDW. This is in clear contradiction with the behaviour expected of a d-wave superconductor for which both magnetic and non-magnetic defects should suppress \$T_{\textbackslash}mathrmc\$. Our results thus make an unambiguous case for the strong detrimental effect of the CDW on bulk superconductivity in La\$_1.875\$Ba\$_0.125\$CuO\$_4\$. Using tunnel diode oscillator (TDO) measurements, we find evidence for dynamic layer decoupling in PDW phase. Our results establish irradiation-induced disorder as a particularly relevant tuning parameter for the many families of superconductors with coexisting density waves, which we demonstrate on superconductors such as the dichalcogenides and Lu\$_5\$Ir\$_4\$Si\$_10\$.
@book{noauthor_disorder_2018,
title = {Disorder raises the critical temperature of a cuprate superconductor},
url = {http://arxiv.org/abs/1808.05984},
abstract = {With the discovery of charge density waves (CDW) in most members of the cuprate high temperature superconductors, the interplay between superconductivity and CDW has become a key point in the debate on the origin of high temperature superconductivity. Some experiments in cuprates point toward a CDW state competing with superconductivity, but others raise the possibility of a CDW-superconductivity intertwined order, or more elusive pair-density wave (PDW). Here we have used proton irradiation to induce disorder in crystals of La\$\_1.875\$Ba\$\_0.125\$CuO\$\_4\$ and observed a striking 50\% increase of \$T\_{\textbackslash}mathrmc\$ accompanied by a suppression of the CDW. This is in clear contradiction with the behaviour expected of a d-wave superconductor for which both magnetic and non-magnetic defects should suppress \$T\_{\textbackslash}mathrmc\$. Our results thus make an unambiguous case for the strong detrimental effect of the CDW on bulk superconductivity in La\$\_1.875\$Ba\$\_0.125\$CuO\$\_4\$. Using tunnel diode oscillator (TDO) measurements, we find evidence for dynamic layer decoupling in PDW phase. Our results establish irradiation-induced disorder as a particularly relevant tuning parameter for the many families of superconductors with coexisting density waves, which we demonstrate on superconductors such as the dichalcogenides and Lu\$\_5\$Ir\$\_4\$Si\$\_10\$.},
year = {2018},
keywords = {disorder, intertwined}
}
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