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SUMMARY:Hidden Order of Cooper Pairs in a Striped Cuprate at High Magnetic
  Fields (SP and QM) - Dragana Popović\, National High Magnetic Field Labo
 ratory\, Florida State University
DTSTART:20170531T131500Z
DTEND:20170531T141500Z
UID:TALK72866@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:In two-dimensional (2D) systems\, the nature of the magnetic-f
 ield-tuned transition from a superconducting to a normal state remains an 
 open question.  In underdoped cuprate superconductors\, which are quasi-2D
  materials\, the normal state is commonly probed by applying a perpendicul
 ar magnetic field (H) to suppress superconductivity.  However\, the identi
 fication and understanding of the H-induced normal state in cuprates has b
 een a challenge because of the complex interplay of disorder\, temperature
  and quantum fluctuations\, and the near-universal existence of charge-den
 sity-wave correlations.  This talk will describe a comprehensive study of 
 linear and nonlinear transport down to temperatures (T) as low as 0.016 K 
 and H up to 35 T in La1.7Eu0.2Sr0.1CuO4\, a superconductor with a “strip
 ed” charge order present already at H=0.  The results reveal for the fir
 st time a full sequence of ground states as a function of H in a striped c
 uprate: a superconductor\, a wide regime of superconducting phase fluctuat
 ions or a vortex liquid\, and a high-field normal state.  Most strikingly\
 , an unanticipated\, domelike (T\, H) region of insulating\, hysteretic be
 havior emerges below ~0.05 K within the vortex liquid\, indicating the ord
 ering of localized Cooper pairs within the charge stripes in the planes. T
 his finding also supports proposals that superconductivity in “striped
 ” La-based cuprates takes the form of a pair density wave\, a new phase 
 of matter.
LOCATION:Mott Seminar Room (Mott Building Room 531)\, Cavendish Laboratory
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