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UID:DSC-22086
DTSTART;TZID=Europe/Berlin:20250630T145000
SEQUENCE:1751261987
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20250630T162000
URL:https://dresden-science-calendar.org/calendar/en/detail/22086
LOCATION:TUD\,    
SUMMARY:Zelenskiy: Order\, Excitations\, and Duality in AB-Stacked Kagome M
 agnets
CLASS:PUBLIC
DESCRIPTION:Speaker: Andrey Zelenskiy\nInstitute of Speaker: Université Pa
 ris-Saclay\, France\nTopics:\nPhysik\n Location:\n  Name: TUD (REC/C213)\n
   Street:   \n  City:  \n  Phone: \n  Fax: \nDescription: <p><strong>Abstr
 act</strong></p> <p>Geometric frustration occurs when interactions favour 
 local configurations that are incompatible with the global geometry of the
  system. This often gives rise to complex structures and patterns\, which 
 are formed from \"suboptimal\" local arrangements. In magnetic crystals\, 
 geometric frustration often stabilizes noncollinear spin configurations\, 
 which in turn influence bulk properties relevant to technological applicat
 ions. I will present a study of magnets with a hexagonal AB-stacked kagome
  structure. These materials gained a significant amount of attention due t
 o the observation of the anomalous Hall effect in Mn3X (X = Ge\, Sn\, Ga)\
 , related to the noncollinear spin structure\, as well as studies of incom
 mensurate phases in Fe3Sn2 compounds. Despite significant experimental and
  theoretical advances\, the exact form of the microscopic Hamiltonian rema
 ins debated in the literature. I will present a symmetry-based microscopic
  model\, which includes a number of previously overlooked magnetic interac
 tions [3]. These magnetic couplings are categorized by the \"degree\" of 
 anisotropy: isotropic\, XY\, and fully anisotropic. Surprisingly\, at each
  level of anisotropy\, we are able to identify a number self-duality trans
 formations\, which connect the properties of distinct magnetic phases. We 
 use these transformations to systematically characterize the static and dy
 namic properties of the AB-stacked kagome magnets [4]. Finally\, I will d
 iscuss an unconventional type of magnetic phase\, which is stabilized by s
 trong intra- and inter-layer Dzyaloshinskii-Moriya interactions. These pha
 ses manifest as disordered patterns with short-range order\, emerging afte
 r a nematic transition a chiral paramagnetic state [5].</p> <p>[1] Ikhlas
 \, M.\, et al. Nature Phys. <strong>13</strong>\, 1085–1090 (2017)</p> <
 p>[2] Kong\, L.\, et al. Phys. Rev. B <strong>107</strong>\, 174425 (2023)
 </p> <p>[3] Zelenskiy\, A.\, Monchesky\, T. L.\, Plumer\, M. L.\, and Sout
 hern\, B. W. Phys. Rev. B <strong>103</strong>\, 144401 (2021)</p> <p>[4] 
 Zelenskiy\, A.\, Monchesky\, T. L.\, Plumer\, M. L.\, and Southern\, B. W.
  Phys. Rev. B <strong>106</strong>\, 144433 (2022)</p> <p>[5] Zelenskiy\, 
 A.\, Plumer\, M. L.\, Southern\, B. W.\, Zhitomirsky\, M. E.\, Monchesky\,
  M. L. Phys. Rev. B <strong>108</strong>\, L060402 (2023)</p> <p><strong>Z
 </strong><strong>oom</strong><strong>:</strong> 688 4227 2214 (https://tu-
 dresden.zoom-x.de/j/68842272214?pwd=2nPGt3aESuZVlyhMAyv96TZRxkU9F9.1)\, Pa
 sscode: IFMP2024-5</p>
DTSTAMP:20260418T192754Z
CREATED:20250623T053612Z
LAST-MODIFIED:20250630T053947Z
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