Commensurate - Incommensurate vortex phase in a nanopatterned superconductor

8th STATPHYS-KOLKATA

Shaw, Gorky^1,4,5 ; Banerjee, S.S.^1 ; Tamegai, T.^2 ; Suderow, Hermann^3

Department of Physics, Indian Institute of Technology, Kanpur

208016, India^1

Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo

113-8656, Japan^2

Laboratorio de Bajas Temperaturas, Unidad Asociada UAM, CSIC, Instituto N. Cabrera, Condensed Matter Physics Center, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid

E-28049, Spain^3

Université Grenoble Alpes, Institut Néel, Grenoble

F-38042, France^4

CNRS, Institut Neel, Grenoble

F-38042, France^5

关键词: Applied magnetic fields;    Intrinsic pinning;    Local magnetic field;    Magnetic field gradient;    Magnetooptical imaging;    Pinning properties;    Shielding current density;    Triangular arrays;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/638/1/012009/pdf
DOI  :  10.1088/1742-6596/638/1/012009

来源: IOP

【 摘 要 】

Magneto-optical imaging studies on a high-quality Bi2Sr2CaCu2O8single crystal partially patterned with a triangular array of holes reveal enhanced flux shielding in the patterned region of the sample. By mapping local magnetic field and shielding current density distributions at different applied magnetic fields and temperatures we determine the regime where pinning from the patterned holes dominates over the intrinsic pinning in the sample. In this regime, the flux density near the center of the patterned region is observed to increase when the applied field is varied from below the matching field to just above it, while significant magnetic field gradients are sustained in the patterned region. Our measurements indicate heterogeneous pinning properties of the vortex population, exhibiting signatures of both weak and strong pinning, in the nanopatterned region of the superconductor.