BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ConQuMat - TRR360 - ECPv6.16.0//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://www.trr360.de
X-WR-CALDESC:Events for ConQuMat - TRR360
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241106T140000
DTEND;TZID=Europe/Berlin:20241106T150000
DTSTAMP:20260512T200513
CREATED:20241104T134303Z
LAST-MODIFIED:20241104T140146Z
UID:4312-1730901600-1730905200@www.trr360.de
SUMMARY:TRR 360 Seminar: Imaging superconductors at high pressure using a nanoscale quantum sensor Christopher Laumann
DESCRIPTION:Imaging superconductors at high pressure using a nanoscale quantum sensor \nChristopher LaumannBoston University\, USA \n  \nPressure alters the physical\, chemical and electronic properties of matter. By compressing a material between two opposing brilliant cut diamonds\, the diamond anvil cell enables tabletop experiments to 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 had 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 materials. When compressed to megabar pressures\, these so-called super-hydrides are believed to exhibit the highest known critical temperatures\, and have led to a nascent field that is equal parts exciting and controversial. Part of this controversy stems from the nature of the tool itself: especially at high pressures\, it is tremendously challenging to extract local information from within a diamond anvil cell. \n  \nWe describe a new approach to directly “see” the physics inside the sample chamber of a diamond anvil cell at ultra-high pressures. The basic idea is deceptively simple: we directly integrate a thin layer of quantum sensors\, the NV defect\, into the surface of the diamond anvil that is actually applying the pressure. We demonstrate the ability to perform optical diffraction-limited imaging of both stress fields and magnetism\, with the latter allowing us to image the magnetic field expulsion associated with superconductivity. Applying our techniques to cerium hydride\, we observe the dual signatures of superconductivity: diamagnetism characteristic of the Meissner effect and a sharp drop of the resistance to near zero. By locally mapping both the diamagnetic response and flux trapping\, we directly image the geometry of superconducting regions\, showing marked inhomogeneities at the micron scale. \n  \nPrimary ref:[1] P. Bhattacharyya et al.\, Nature 627\, 73–79 (2024). \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-imaging-superconductors-at-high-pressure-using-a-nanoscale-quantum-sensor-christopher-laumann/
LOCATION:Technical University Munich + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241112T160000
DTEND;TZID=Europe/Berlin:20241112T170000
DTSTAMP:20260512T200513
CREATED:20241107T102110Z
LAST-MODIFIED:20241112T154938Z
UID:4333-1731427200-1731430800@www.trr360.de
SUMMARY:TRR 360 Seminar: Multi-Extreme THz ESR Study of the Pressure-Induced Phase Transition in the Shastry-Sutherland Model Substance SrCu2(BO3)2 Hitoshi Ohta
DESCRIPTION:Multi-Extreme THz ESR Study of the Pressure-Induced Phase Transition in the Shastry-Sutherland Model Substance SrCu2(BO3)2 \nProf. Dr. Hitoshi Ohta \nMolecular Photoscience Research Center\, Kobe University\, JapanResearch Center for Development of Far-Infrared Region\, University of Fukui\, Japan \nWe have been developing THz ESR under multi-extreme conditions\, such as high magnetic field\, high pressure and low temperature in Kobe. It covers the frequency region between 0.03 and 7 THz\,1 the temperature region between 1.8 and 300 K\,1 the magnetic field region up to 55 T\,1 and the pressure region is extended from 1.5 GPa2 to 2.5 GPa using the hybrid-type piston-cylinder pressure cell.3 It also includes mechanically detected ESR4 measurements using a commercially available membrane-type surface stress sensor\, which is the extension from our micro-cantilever ESR5. As an example\, application of high pressure THz ESR to understand the pressure-induced phase transition in the Shastry-Sutherland model substance SrCu2(BO3)2 will be discussed. Using our technique\, we were able to determine the pressure where the pressure-induced phase transition occurs\, and obtain the pressure dependence of exchange interactions in SrCu2(BO3)2 [Ref. 6]. Comparison of our results with the theory will be discussed. \n\nH. Ohta et al.\, J. Low Temp. Phys. 2013\, 170\, 511.\nT. Sakurai et al.\, Rev. Sci. Inst. 2007\, 78\, 065107\nK. Fujimoto et al.\, Appl. Mag. Res. 2013\, 44\, 893; H. Ohta et al.\, J. Phys. Chem. B 2015\, 119\, 13755; T. Sakurai et al.\, J. Mag. Res.\, 2015\, 259\,108.\nH. Takahashi et al.\, Rev. Sci. Intrum. 2018\, 89\, 036108\nH. Ohta et al.\, AIP Conf. Proceedings 2006\, 850\, 1643; E. Ohmichi et al.\, Rev. Sci. Instrum. 2008\, 79\, 103903; H. Takahashi et al.\, Appl. Phys. Lett. 2015\, 107\, 182405.\nT. Sakurai et al.\, J. Phys. Soc. Jpn. 87 (2018) 033701\n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-multi-extreme-thz-esr-study-of-the-pressure-induced-phase-transition-in-the-shastry-sutherland-model-substance-srcu2bo32-hitoshi-ohta/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
END:VCALENDAR