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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure

TT 2.5: Vortrag

Montag, 16. März 2020, 10:30–10:45, HSZ 103

Detection and control of phase slip lines in plain superconducting NbSe₂ devices — •Nicola Paradiso¹, Michaela Eichinger¹, Christian Bäuml¹, Kenji Watanabe², Takashi Taniguchi², and Christoph Strunk¹ — ¹University of Regensburg — ²National Institute for Materials Science, Tsukuba, Japan

In ordinary superconductors the dissipationless state is destroyed when the current density reaches a critical value, known as depairing current. On the other hand, it was recently found [1,2] that in superconducting 2D materials as NbSe₂, dissipation emerges as a sequential nucleation of so-called phase slip lines (PSL). Such nucleation occurs for current densities well below the depairing value. Here we study PSLs on plain few-layer NbSe₂ crystals. By transport measurements we can observe the repulsive interaction between PSLs. Moreover, by using a carbon nanotube as a local heater, we can locally tune the critical current for the nucleation of one individual PSL. Our observations show that PSLs are localized and interacting objects, whose nucleation can be locally controlled.

[1] N. Paradiso et al., 2D Materials, 6, 025039 (2019);

[2] S. Tran et al., arXiv:1903.00453v3 (2019).