2001/08/31 by E. Bielejec, Edward S. Bielejec, Wenhao Wu · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.88.206802
published as Phys. Rev. Lett. 88, 206802 (2002) · RevTex 4 pages, 4 figures, and 1 table minor changes
arxiv created 2001/10/30 · openalex publication_date 2002/05/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The magnetic-field-tuned superconductor-insulator transition has been studied in ultrathin beryllium films quench condensed near 20 K. In the zero-current limit, a finite-size scaling analysis yields the scaling exponent product \ensuremathνz\phantom\rule0ex0ex=\phantom\rule0ex0ex1.35\ifmmode±\else\textpm\fi0.10 and a critical sheet resistance, Rc, of about 1.2RQ, with RQ\phantom\rule0ex0ex=\phantom\rule0ex0exh/4e2. However, in the presence of dc bias currents that are smaller than the zero-field critical currents, \ensuremathνz becomes 0.75\ifmmode±\else\textpm\fi0.10. This new set of exponents suggests that the field-tuned transitions with and without a dc bias current belong to different universality classes.