2008/02/19 by S. I. Vedeneev, D. K. Maude · 5 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Exponent #Josephson effect #Magnetic and transport properties of perovskites and related materials #Magnetic field #Mechanics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #Vortex #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.064511
published in Physical Review B 77(6) (American Physical Society)
openalex publication_date 2008/02/19 · arxiv created 2008/02/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have investigated the in-plane I\text\ensuremath-V characteristics and the Josephson-vortex flow resistance in high-quality La-free Bi2+xSr_2\ensuremath-xCuO_6+\ensuremathδ (Bi-2201) single crystals in parallel and tilted magnetic fields at temperatures down to 40 mK. For parallel magnetic fields below the resistive upper critical field Hc2^\ensuremath∗, the I\text\ensuremath-V characteristics obey a power law with a smooth change with increasing magnetic field of the exponent from above 5 down to 1. In contrast to the double-layer cuprate Bi-2212, the observed smooth change suggests that there is no change in the mechanism of dissipation (no Kosterlitz-Thouless transition) over the range of temperatures investigated. At small angles between the applied field and the ab plane, prominent current steps in the I\text\ensuremath-V characteristics and periodic oscillations of Josephson-vortex flow resistance are observed. While the current steps are periodic in the voltage at constant fields, the voltage position of the steps, together with the flux-flow voltage, increases nonlinearly with magnetic field. The ab-flow resistance oscillates as a function of field with a constant period over a wide range of magnetic fields and temperatures. The current steps in the I\text\ensuremath-V characteristics and the flow resistance oscillations can be linked to the motion of Josephson vortices across layers.