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SUMMARY:TRR 360 Seminar: Hidden multipolar order and singlet magnetism in f-electrons systems Sergii Khmelevskyi
DESCRIPTION:Hidden multipolar order and singlet magnetism in f-electrons systems \nDr. Sergii Khmelevskyi \nTU Wien \nThe nature of order in low-temperature phases of some materials is not directly seen by experiment. Such “hidden orders” (HOs) may inspire decades of research to identify the mechanism underlying those exotic states of matter. In insulators\, HO phases originate in degenerate many-electron states on localized f-shells that may harbor high-rank multipole moments. We show how the ground-state order and magnetic excitations of a prototypical HO system NpO2\, can be fully described by a low-energy Hamiltonian derived by a many-body ab initio force theorem method. A primary non collinear order of time odd rank 5 (triakontadipolar) moments has been predicted. We show also that exotic non-chiral magnetic order in PrO2 is a results of a strong high order multipolar interactions within whole |JM> ground state multiplet. The multipolar interactions also leads to the peculiar magnetization process in PrO2 resulting in the exotic meta-magnetic transition in the applied magnetic field and fully dominate the ordinary dipolar Heisenberg exchange. \nAs has been shown by Kotliar and Haule in 2007 the canonical and perhaps most investigated metallic “hidden” order materials URu2Si2 can also develop a “hidden” multipolar order (hexadecapolar) due to localized 5f2 configuration at low temperature. Whereas at higher temperatures a hybridization of the localized 5f-levels leads to the Kondo behavior (“Kondo arrest scenario”) and at very low temperature a hidden order phase coexists with superconductivity. We reveal on basis of correlated ab-intio calculations a close analogy between normal state behavior of URu2Si2 and newly discovered heavy fermion UTe2 superconductor. \n\n\n\n\n\n\nVenue
URL:https://www.trr360.de/event/trr-360-seminar-sergii-khmelevskyi/
LOCATION:University of Augsburg\, Room S-288 + Zoom
CATEGORIES:Seminar
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DTSTART;TZID=Europe/Berlin:20241030T090000
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CREATED:20241024T142401Z
LAST-MODIFIED:20241024T144026Z
UID:4207-1730278800-1730284200@www.trr360.de
SUMMARY:Introduction to the electronic lab book ELabFTW
DESCRIPTION:An introduction to the electronic lab book eLabFTW is scheduled for next Wednesday\, October 31st at 9:00 a.m. in the seminar room of EPII (room 344\, north) at the University of Augsburg.This will be a hybrid seminar\, conducted in parallel online.The Zoom link and login details are provided by email to all TRR 360 staff members.
URL:https://www.trr360.de/event/introduction-the-the-electronic-lab-book-elabftw/
CATEGORIES:Sonderseminar
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