Abstract
We present the fabrication and electrical transport characterization of underdoped YBa2Cu3O7-δ nanowires. The nanowires have been realized without any protective capping layer and they show transport properties similar to those of the parent thin film, demonstrating that they have not been damaged by the nanopatterning. The current-voltage characteristics of the underdoped nanowires show large hysteretic voltage switching at the critical current, in contrast to the flux-flow like characteristics of optimally doped nanostructures, indicating the formation of a self-stabilizing hot spot. These results open up new possibilities for using the underdoped nanowires as single photon detectors and for exploring the underdoped side of the YBa2Cu3O7-δ phase diagram at the nanoscale.
Highlights
Investigation of superconducting YBa2Cu3O7-δ (YBCO) nanowires at different levels of oxygen doping can give access to a variety of new experiments to elucidate the still unknown mechanism for high critical temperature superconductors (HTS)
It is well established that the complex phase diagram of HTS is dominated by various local electronic orders that are intertwined with superconductivity and become stronger in the underdoped region of the phase diagram [1]
We have presented the realization of high-quality underdoped YBCO nanowires
Summary
Investigation of superconducting YBa2Cu3O7-δ (YBCO) nanowires at different levels of oxygen doping can give access to a variety of new experiments to elucidate the still unknown mechanism for high critical temperature superconductors (HTS). The material is chemically unstable compared to low critical temperature superconductors (LTS), which makes it difficult to fabricate nanostructures without severe degradation [17,18,19]. We demonstrate that the nanowires show properties similar to those of the pristine underdoped thin film which implies that we do not damage the material during the fabrication process. We discuss the main physical requirements for the nanowires to be employed as SNSPDs. We demonstrate that our underdoped nanowires show large hysteretic voltage switching which indicates selfsustained hot spot formation despite the comparably large thickness. We demonstrate that our underdoped nanowires show large hysteretic voltage switching which indicates selfsustained hot spot formation despite the comparably large thickness These results pave the way for possible future applications of YBCO nanowires as SNSPDs
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