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Physics Colloquium: Roman Movshovich, Los Alamos National Laboratory
Event Postponed
Intertwined Orders in Heavy-Fermion Superconductor CeCoIn5
CeCoIn5 is a fascinating material. It manages to touch on many of the forefront areas of research in condensed matter, such as unconventional d-wave superconductivity and quantum criticality. It is a Pauli paramagnet, which leads to first order superconducting transition in high field. Same physics may lead to spatially inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov superconductivity. CeCoIn5 also displays behavior not found in other materials, such as a unique high field low temperature phase (HFLT) with magnetic order that only exists within the superconducting state. The magnetism disappears together with superconductivity at a superconducting critical field. The HFLT is therefore a quintessential example of intertwined orders, where magnetism needs superconductivity for its very existence. Our measurements of heat transport in rotating magnetic field [1] show that a third order must be present in the HFLT phase. More recent Nd-doping studies indicate that intertwined states are a general phenomenon, likely to occur whenever unconventional superconductivity and magnetism coexists. I will also present some very recent puzzling results that CeCoIn5 keeps providing us with.
Wednesday, March 11, 2020 at 4:00pm
Higgins Hall, 310
Higgins Hall, Chestnut Hill, MA 02467
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