Scanning SQUID susceptometry of a paramagnetic superconductor

J. R. Kirtley,1 B. Kalisky,1,2 J. A. Bert,3 C. Bell,3 M. Kim,3 Y. Hikita,3 H. Y. Hwang,3 J. H. Ngai,4 Y. Segal,4,* F. J. Walker,4 C. H. Ahn,4 and K. A. Moler1,3 1Departments of Physics and Applied Physics, Stanford University, Stanford, California 94305, USA 2Department of Physics, Nano-magnetism Research Center, Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel 3Stanford Institute for Materials and Energy Science, Stanford University, Stanford, California 94305, USA 4Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA (Received 16 April 2012; revised manuscript received 6 June 2012; published 15 June 2012)