Emergent quasi-particles in frustrated magnets

Date: 
11/12/2021 - 3:30pm to 4:30pm
Location: 
CP-155
Speaker(s) / Presenter(s): 
Collin Broholm (IQM, Johns Hopkins)
Type of Event (for grouping events):
Crystalline solids with Interacting local moments that do not fully order at low
temperatures can support a variety of strongly correlated electronic phenomena. With no
static magnetism or symmetry breaking, the quantum spin liquid (QSL) represents an
important albeit rare limit [1]. A much larger variety of materials has been found to
have spin liquid like properties in restricted temperature and frequency regimes. I shall
describe experiments that explore such materials by scattering neutrons from their
emergent magnetic quasi-particles. The materials range from insulating rare earth
oxides through transition metal oxides near the metal insulator transition to Kondo
semi-metals and heavy fermions systems. Conducted using the latest neutron scattering
instrumentation, the experiments offer detailed atomic scale insights into strongly
correlated phenomena that challenge conventional understanding of magnetism in
solids.
*This work was supported as part of the Institute for Quantum Matter, an Energy
Frontier Research Center funded by the U.S. Department of Energy, Office of Science,
Basic Energy Sciences under Award No. DE-SC0019331 and by the Gordon and Betty
Moore foundation through the EPIQS program GBMF9456.
[1] C. Broholm, R. J. Cava, S. A. Kivelson, D. G. Nocera, M. R. Norman, and T.
Senthil, Science, Vol. 367, Issue 6475, (2020).

 

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