Doping dependence of the upper critical field in untwinned YBa${}_2$Cu${}_3$O${}_{7-\delta }$ thin films

Abstract

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${}_{7-\delta }$ 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.

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Cited by in corpus (1)

• Boosting superconductivity in ultrathin YBa${}_2$Cu${}_3$O${}_{7-\delta }$ films via nanofaceted substrates