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000827096 1001_ $$0P:(DE-Juel1)130812$$aLyatti, Matvey$$b0$$ufzj
000827096 245__ $$aUltra-thin YBa$_{2}$Cu$_{3}$O$_{7-x}$ films with high critical current density
000827096 260__ $$aBristol$$bIOP Publ.$$c2016
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000827096 520__ $$aDespite impressive progress in the development of superconducting nanowire single-photon detectors (SNSPD), the main obstacle for the widespread use of such detectors is the low operating temperature required for low-temperature superconductors. The very attractive idea of increasing the operating temperature using high-temperature superconductors for SNSPD fabrication is problematic due to the insufficient quality of ultra-thin films from high-temperature superconductors, which is one of the key requirements for the single-photon detection by superconducting nanowires. In this work, we demonstrate the possibility of fabricating ultra-thin YBa2Cu3O7−x films on SrTiO3 substrates with a surface flatness of ±1 unit cell and a high critical current density up to 14 MA cm−2 at T = 78 K. The critical current density of ultra-thin films had very low value in the first three unit cell layers adjacent to the substrate and reached nearly the bulk value at the fifth layer. 97% of the superconducting current is carried by only two upper layers of a 5-unit-cell thick YBa2Cu3O7−x film. Due to such superconducting current distribution over the film thickness and good surface flatness 5-unit-cell thick YBa2Cu3O7−x films could be promising for the fabrication of single-photon detectors.
000827096 536__ $$0G:(DE-HGF)POF3-143$$a143 - Controlling Configuration-Based Phenomena (POF3-143)$$cPOF3-143$$fPOF III$$x0
000827096 7001_ $$0P:(DE-Juel1)159473$$aSavenko, Aleksei$$b1
000827096 7001_ $$0P:(DE-Juel1)130898$$aPoppe, Ulrich$$b2$$ufzj
000827096 773__ $$0PERI:(DE-600)1361475-7$$a10.1088/0953-2048/29/6/065017$$n6$$p065017$$tSuperconductor science and technology$$v29$$x0953-2048$$y2016
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