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

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.

Doping dependence of the upper critical field in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films

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Doping dependence of the upper critical field in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films

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Doping dependence of the upper critical field in untwinned YBa22​Cu33​O7−δ7−δ​ thin films

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Doping dependence of the upper critical field in untwinned YBa22​Cu33​O7−δ7−δ​ thin films

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Doping dependence of the upper critical field in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films

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Doping dependence of the upper critical field in untwinned YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ thin films

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