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We have irradiated high-quality $\hbox{YBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$ thin films with 90-keV helium and 175-keV neon ions to compare how ions of different mass affect electrical transport and reduce superconducting transition temperature. We measure the temperature dependence of the resistivity for films irradiated with different fluence and compare the results with Monte Carlo ion implantation...
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