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CATEGORIES:Quantum Matter Seminar
SUMMARY:What is really extraordinary in superconducting cu
 prates? - Professor Ivan Bozovic\, Brookhaven Nati
 onal Laboratory and Applied Physics Department\, Y
 ale University
DTSTART;TZID=Europe/London:20180413T141500
DTEND;TZID=Europe/London:20180413T151500
UID:TALK101818AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/101818
DESCRIPTION:Superconductivity in cuprates has many mysterious 
 facets\, but the most important question is why th
 e critical\ntemperature (Tc ) is so high. Our expe
 riments target this question.\nWe use atomic-layer
 -by-layer molecular beam epitaxy to synthesize ato
 mically perfect thin films and multilayers\nof cup
 rates and other complex oxides. By atomic-layer en
 gineering\, we optimize the samples for a particul
 ar experiment.\n[1]\nI will present the results of
  a focused and comprehensive study that took twelv
 e years and over two thousand\ncuprate samples\, p
 erhaps without precedence in Condensed Matter Phys
 ics. We have measured the key physical\nparameters
  of the normal and superconducting states and esta
 blished their precise dependence on doping\,\ntemp
 erature\, and external fields. This large data bas
 is 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 diagram. Next\, the rotation
 al symmetry of the electron fluid in the normal\nm
 etallic state above Tc is always spontaneously bro
 ken — the so-called “electronic nematicity” — unli
 ke in\nstandard metals that behave like Fermi Liqu
 ids. Finally\, the insulating state on the underdo
 ped side is also unusual\,\nwith mobile charge clu
 sters formed by localized pairs. All these feature
 s are quite exceptional and point to a\nnew pictur
 e of high-Tc superconductivity in cuprates.\n[1] N
 ature 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 (20
 13)\; 12\, 47\n(2013)\; 11\, 850 (2012). Nature Ph
 ysics 10\, 256 (2014)\; 7\, 298 (2011). Nature Nan
 otechnology 9\, 443 (2014)\; 5\, 516 (2010).\nNatu
 re Communications 2\, 272 (2011). Phys. Rev. Lette
 rs 106\, 237003 (2011)\; 102\, 107004 (2009)\; 101
 \, 247004 (2008)\; 93\,\n157002 (2004)\; 89\, 1070
 01 (2002). Proc. Nat. Acad. Sci. 113\, 4284 (2016)
 \; 107\, 8103 (2010).\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, D
 epartment of Physics
CONTACT:Romy Hall
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