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DTSTART;TZID=Europe/Berlin:20261103T160000
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CREATED:20260707T120103Z
LAST-MODIFIED:20261013T092428Z
UID:6853-1793721600-1793725200@www.trr360.de
SUMMARY:TRR 360 Seminar:A fresh look on frustration: spin-Peierls Transition in spinels and Curie-law crossoverLudovic Jaubert
DESCRIPTION:A fresh look on frustration: spin-Peierls Transition in spinels and Curie-law crossover\n \nProf. Dr. Ludovic Jaubert \nLaboratoire Ondes et Matière d’AquitaineUniversity of Bordeaux\, France \n  \nIn this seminar\, we will provide a fresh look on two canonical questions in frustrated magnetism: transitions in spinels and the Curie-Weiss law. \nThe chromium spinels (e.g. MgCr2O4\, ZnCr2O4 …) are prime examples of the highly frustrated pyrochlore lattice antiferromagnet. Experiment has carefully established that these materials\, upon cooling\, distort to lower symmetry and order magnetically. Here we will study the nature of the transition by a combination of density-functional-theory based energy mapping and classical Monte Carlo simulations [1\,2]. Based on ab-initio Hamiltonian parameters\, we will simulate both materials and estimate the respective ordering temperatures of the high- and low-symmetry structures. Comparing our results with experiments\, we find that simulations are consistent with a type of spin-Peierls mechanism\, adapted to three dimensions\, where the structural distortion is mediated by a magnetic energy gain thanks to a lower degree of frustration. \nIn a second part\, we will revisit the textbook Curie-Weiss law\, in the context of frustration. The Curie-Weiss law is widely used to estimate the strength of frustration in frustrated magnets. However\, this law was originally derived as an estimate of magnetic correlations close to a mean-field phase transition\, which—by definition—is absent in spin liquids. Instead\, the susceptibility of spin liquids undergoes a Curie-law crossover between two magnetically disordered regimes. Here\, we study the generic aspect of the Curie-law crossover by comparing a variety of frustrated spin models in two and three dimensions [3]\, using both classical Monte Carlo simulations and analytical Husimi tree calculations. Husimi tree calculations fit remarkably well the simulations for all temperatures and almost all lattices. Based on this result\, we propose a Husimi ansatz for the magnetic susceptibility 𝜒⁢\, in order to estimate the Curie-Weiss temperature 𝜃cw. We apply the Ansatz to experimental measurements of various frustrated materials\, showing that it fits the data as well\, if not better\, than the traditional Curie-Weiss law. \n[1] Jeschke\, Iqbal & Jaubert\, Physical Review Letters 134\, 086702 (2025)[2] Jeschke\, Iqbal & Jaubert\, in preparation[3] Pohle & Jaubert\, Physical Review B 108\, 024411 (2023) \n\n\n\n\n\n\n \n\n\n\n \n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartbaludovic-jaubert/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20261110T100000
DTEND;TZID=Europe/Berlin:20261111T160000
DTSTAMP:20260713T110147Z
CREATED:20260713T110058Z
LAST-MODIFIED:20260713T110147Z
UID:6886-1794304800-1794412800@www.trr360.de
SUMMARY:Young Researchers Forum 2026
DESCRIPTION:The circle closes when we meet again in Augsburg for the last YR Forum of the first funding period. For most of us\, our journey together in the MGK has started in Augsburg three years ago.  \n\n\n\n \n\n\n\nAs tradition dictates\, there will be a Focus Lecture\, but there will also be a meeting with a start-up founder from our physics institute\, a workshop about “AI in science” and\, of course\, a lot of networking and fun. Addtionally\, interested people can come with us to visit DELO\, hidden champions in high-tech adhesives close to Landsberg. They are very eager to meet young motivated physicists. We are looking forward to see all of you in Augsburg! \n\n\n\n \n\n\n\nFor more information check our website: https://www.trr360.de/mgk/yr-forum-2026/ !
URL:https://www.trr360.de/event/young-researchers-forum-2026/
LOCATION:University of Augsburg\, Universitätsstr. 2\, Augsburg\, 86159
CATEGORIES:Events,MGK events
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20261117T160000
DTEND;TZID=Europe/Berlin:20261117T170000
DTSTAMP:20261013T092150Z
CREATED:20260804T102423Z
LAST-MODIFIED:20261013T092150Z
UID:6920-1794931200-1794934800@www.trr360.de
SUMMARY:TRR 360 Seminar:tba Marios Michael
DESCRIPTION:tba \nDr. Marios Michael \nMax Planck Institute for the Structure and Dynamics of Matter\, Hamburg \nMax Planck Institute for the Physics of Complex Systems\, Dresden \n\n\n\n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-marios-michael/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20270202T160000
DTEND;TZID=Europe/Berlin:20270202T170000
DTSTAMP:20261013T093625Z
CREATED:20261013T093623Z
LAST-MODIFIED:20261013T093625Z
UID:7162-1801584000-1801587600@www.trr360.de
SUMMARY:TRR 360 Seminar:tba Balazs Hetenyi
DESCRIPTION:tba \nDr. Balazs Hetenyi \nWigner Research Centre for Physics\, Budapest\, Hungary \n  \n\n\n\n\n\n\n \n\n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminartba-balazs-hetenyi/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20270204T090000
DTEND;TZID=Europe/Berlin:20270205T150000
DTSTAMP:20260317T165733Z
CREATED:20260317T165732Z
LAST-MODIFIED:20260317T165733Z
UID:6493-1801731600-1801839600@www.trr360.de
SUMMARY:On-site Evaluation
DESCRIPTION:The TRR360 wants to go in the second round! On 4-5 February\, our proposal for the next 4-year period will be evaluated at the Technical University of Munich. More details will follow later. Here\, you can find a rough plan what is going to happen on these days: \n\n\n\n \n\n\n\nFirst day 4.2.2027 \n\n\n\nEach project will give a presentation in the morning and present a poster in the afternoon about their achievements in the first phase and their future plans. In this part\, all members of the TRR360 need to be on site. \n\n\n\nSecond day 5.2.2027 \n\n\n\nThe Steering Committe and\, possibly\, chosen PIs have anwer the assessors. \n\n\n\n\n\n\n\n \n\n\n\nVenue
URL:https://www.trr360.de/event/on-site-evaluation/
LOCATION:Technical University Munich
CATEGORIES:Events
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20270524T120000
DTEND;TZID=Europe/Berlin:20270526T170000
DTSTAMP:20260325T100654Z
CREATED:20260325T100652Z
LAST-MODIFIED:20260325T100654Z
UID:6561-1811160000-1811350800@www.trr360.de
SUMMARY:YR Workshop 2027
DESCRIPTION:For the last event of the first funding period\, we have decided to visit the beautiful town Brixen in South Tyrol. Here\, we can have workshops\, talks\, trainings and\, mostly\, a lot of time together for exchange\, discussions and networking. If you have a good idea what you would like to do\, let Ina and Gloria know.
URL:https://www.trr360.de/event/yr-workshop-2027/
LOCATION:CUSANUS Academie\, Seminarplatz 2\, Brixen\, 39042\, Italy
CATEGORIES:Events,MGK events
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