Diamond magnetometry of superconducting thin films Academic Article uri icon

abstract

  • Department of Physics, University of California at Berkeley, Berkeley, CA 94720-7300, USA(Dated: February 7, 2014)In recent years diamond magnetometers based on the nitrogen-vacancy (NV) center have beenof considerable interest for applications at the nanoscale. An interesting application which is wellsuited for NV centers is the study of nanoscale magnetic phenomena in superconducting materials.We employ NV centers to interrogate magnetic properties of a thin-layer yttrium barium copperoxide (YBCO) superconductor. Using uorescence-microscopy methods and samples integrated withan NV sensor on a microchip, we measure the temperature of phase transition in the layer to be70:0(2) K, and the penetration eld of vortices to be 46(4) G. We observe pinning of the vortices inthe layer at 65 K, and estimate their density after cooling the sample in a ˘10 G eld to be 0:45(1)m

publication date

  • January 1, 2014