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SUMMARY:What is really extraordinary in superconducting cuprates? - Profes
 sor Ivan Bozovic\, Brookhaven National Laboratory and Applied Physics Depa
 rtment\, Yale University
DTSTART:20180413T131500Z
DTEND:20180413T141500Z
UID:TALK101818@talks.cam.ac.uk
CONTACT:Romy Hall
DESCRIPTION:Superconductivity in cuprates has many mysterious facets\, but
  the most important question is why the critical\ntemperature (Tc ) is so 
 high. Our experiments target this question.\nWe use atomic-layer-by-layer 
 molecular beam epitaxy to synthesize atomically perfect thin films and mul
 tilayers\nof cuprates and other complex oxides. By atomic-layer engineerin
 g\, we optimize the samples for a particular experiment.\n[1]\nI will pres
 ent the results of a focused and comprehensive study that took twelve year
 s and over two thousand\ncuprate samples\, perhaps without precedence in C
 ondensed Matter Physics. We have measured the key physical\nparameters of 
 the normal and superconducting states and established their precise depend
 ence on doping\,\ntemperature\, and external fields. This large data basis
  contains a wealth of information and constrains tightly the\ntheory.\nOne
  striking conclusion is that superconducting state cannot be described by 
 the standard Bardeen-Cooper-\nSchrieffer theory\, anywhere in the phase di
 agram. Next\, the rotational symmetry of the electron fluid in the normal\
 nmetallic state above Tc is always spontaneously broken — the so-called 
 “electronic nematicity” — unlike in\nstandard metals that behave lik
 e Fermi Liquids. Finally\, the insulating state on the underdoped side is 
 also unusual\,\nwith mobile charge clusters formed by localized pairs. All
  these features are quite exceptional and point to a\nnew picture of high-
 Tc superconductivity in cuprates.\n[1] Nature 547\, 432 (2017)\; 536\, 309
  (2016)\; 472\, 458 (2011)\; 455\, 782 (2008)\; 422\, 873 (2003). Science 
 359\, xxx (2018)\;\n326\, 699 (2009)\; 316\, 425 (2007)\; 297\, 581 (2002)
 . Nature Materials 12\, 877 (2013)\; 12\, 387 (2013)\; 12\, 1019 (2013)\; 
 12\, 47\n(2013)\; 11\, 850 (2012). Nature Physics 10\, 256 (2014)\; 7\, 29
 8 (2011). Nature Nanotechnology 9\, 443 (2014)\; 5\, 516 (2010).\nNature C
 ommunications 2\, 272 (2011). Phys. Rev. Letters 106\, 237003 (2011)\; 102
 \, 107004 (2009)\; 101\, 247004 (2008)\; 93\,\n157002 (2004)\; 89\, 107001
  (2002). Proc. Nat. Acad. Sci. 113\, 4284 (2016)\; 107\, 8103 (2010).\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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