Evidence of quantum vortex fluid in the mixed state of a very weakly pinned a-MoGe thin film
| Autor: | Dutta, Surajit, Roy, Indranil, Mandal, Soumyajit, Basistha, Somak, Jesudasan, John, Bagwe, Vivas, Raychaudhuri, Pratap |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Quantum fluids refer to a class of systems that remain in fluid state down to absolute zero temperature. In this letter, using a combination of magnetotransport and scanning tunneling spectroscopy down to 300 mK, we show that vortices in a very weakly pinned a-MoGe thin film can form a quantum vortex fluid. Under the application of a magnetic field perpendicular to the plane of the film, the vortex state transforms from a vortex solid to a hexatic vortex fluid and eventually to an isotropic vortex liquid. The fact that the two latter states remain fluid down to absolute zero temperature is evidenced from the electrical resistance which saturates to a finite value at low temperatures. Furthermore, scanning tunneling spectroscopy measurements reveal a soft gap at the center of each vortex, which arises from large zero point fluctuation of vortices. Comment: In view of more recent findings, the data in this (unpublished) preprint has been reanalyzed: Kindly see arXiv:1909.06573 and arXiv:2102.12996 for more rigorous analysis with more extensive data |
| Databáze: | arXiv |
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