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UID:DSC-21895
DTSTART;TZID=Europe/Berlin:20250414T171500
SEQUENCE:1744609110
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20250414T175500
URL:https://www.dresden-science-calendar.de/calendar/de/detail/21895
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Laumann: Gutzwiller Colloquium Part II: Under Pressure: Imaging Hyd
 ride Superconductivity
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Christopher Laumann\nInstitute of Speaker: Boston 
 University\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS ()\n  Street: Nö
 thnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)351 871 0\n  
 Fax: \nDescription: Pressure alters the physical\, chemical and electronic
  properties of matter. By compressing a material between two opposing bril
 liant cut diamonds\, the diamond anvil cell enables tabletop experiments t
 o reach pressures more than a million times that of atmospheric pressure. 
 Since its development over half a century ago\, it has enabled experiments
  to directly access pressure as a thermodynamic tuning parameter and has h
 ad a dramatic impact on quantum science\, chemistry and materials physics.
  Among these impacts\, a tremendous amount of recent attention has focused
  on the discovery of superconductivity in a class of hydrogen-based materi
 als. When compressed to megabar pressures\, these so-called super-hydrides
  are believed to exhibit the highest known critical temperatures\, and hav
 e led to a nascent field that is equal parts exciting and controversial. P
 art of this controversy stems from the nature of the tool itself: especial
 ly at high pressures\, it is tremendously challenging to extract local inf
 ormation from within a diamond anvil cell. We describe a new approach to d
 irectly \"see\" the physics inside the sample chamber of a diamond anvil c
 ell at ultra-high pressures. The basic idea is deceptively simple: we dire
 ctly integrate a thin layer of quantum sensors\, the NV defect\, into the 
 surface of the diamond anvil that is actually applying the pressure. We de
 monstrate the ability to perform optical diffraction-limited imaging of bo
 th stress fields and magnetism\, with the latter allowing us to image the 
 magnetic field expulsion associated with superconductivity. Applying our t
 echniques to cerium hydride\, we observe the dual signatures of supercondu
 ctivity: diamagnetism characteristic of the Meissner effect and a sharp dr
 op of the resistance to near zero. By locally mapping both the diamagnetic
  response and flux trapping\, we directly image the geometry of supercondu
 cting regions\, showing marked inhomogeneities at the micron scale. [1] Bh
 attacharyya\, ...\, CRL\, Yao\, Nature 627\, 73–79 (2024)
DTSTAMP:20260416T000527Z
CREATED:20250411T053708Z
LAST-MODIFIED:20250414T053830Z
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