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SUMMARY:Magnetic Fragmentation in Spin Ice Systems
DTSTART:20230210T151500
DTSTAMP:20260414T105932Z
UID:b0aed64fa6df6c8ef125c691427f53a3c9d91424c725a15755cd752c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Peter C. W. Holdsworth\n\nEcole Normale Supérieure de L
 yon\nThe apparent fragmentation [1\,2] of magnetic moments in spin ice-lik
 e systems into coexisting longitudinal\, transverse and harmonic parts is 
 a direct consequence of emergent electromagnetism in these systems. At the
  microscopic level\, the moments act as elements of this emergent lattice 
 field from which topological defects\, monopoles [3] can be excited. By co
 nstruction\, the left over is made up of a divergence free\, or transverse
  component and a harmonic component controlled by the boundaries. The frag
 mentation process therefore provides a continuous fractionalisation of the
  moments allowing for novel magnetic phases and topological phase transiti
 ons. In this seminar I will review some of these including the partially o
 rdered monopole crystal phase in which a Coulomb spin liquid coexists with
  antiferromagnetic order\, as well as two fluid phases and topological asp
 ects related to the harmonic component. I will also show how fragmentation
  leads naturally to the emergence of classical Dirac strings and how it ca
 n be used as a tool for the analysis of neutron scattering data in the pre
 sence of quantum spin fluctuations [4]. Several experimental examples of f
 ragmented systems will be discussed.\n[1] M. E. Brooks-Bartlett\, S. T. Ba
 nks\, L. D. C. Jaubert\, A. Harman-Clarke\, P. C. W. Holdsworth. “Magnet
 ic-Moment Fragmentation and Monopole Crystallization”. Physical Review X
 \, 2014\, 4\, 011007. \n[2] E. Lhotel\, L.D.C. Jaubert\, P.C.W. Holdswort
 h\, J. Low. Temp. Physics 201\, 710 (2020) \n[3] Castelnovo\, C.\, Moessn
 er\, R. & Sondhi\, S. Magnetic monopoles in spin ice. Nature 451\, 42–45
  (2008). https://doi.org/10.1038/nature06433\n[4] F. Museur\, E. Lhotel\,
  P. C. W. Holdsworth\, arXiv:2209.10239\, 2022\n 
LOCATION:PH L1 503 https://plan.epfl.ch/?room==PH%20L1%20503
STATUS:CONFIRMED
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