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Seminar – Elizabeth Green

Date January 16, 2019 @ 4:00 pm - 5:00 pm

Elizabeth Green – Low Temperature Experiment Candidate Seminar

Fermi Surface Topology Change in Nd-doped CeCoIn5

CeCoIn5, one of the most well-known heavy fermion compounds, exhibits a novel field-induced superconducting state above 10 T for B||c known as the Q-phase. Recent neutron scattering measurements have demonstrated that a similar Q-vector appears at zero applied magnetic field for the 5% Nd-doped CeCoIn5 [1] which has initiated intense theoretical and experimental work on this doping series. In this talk I will present our de Haas-van Alphen (dHvA) effect measurements which show a drastic Fermi-surface reconstruction between 2 and 5% Nddoping levels is responsible for the emergence of this unconventional superconducting state. The cylindrical Fermi surface develops a quasi-three-dimensional topology with increased doping levels thus reducing the likelihood of an enhanced nesting scenario, previously given as a possible explanation for the Q-phase. Effective masses remain unchanged up to 10% Nd, indicating the presence of a spin density wave type of quantum critical point. In addition, I will present evidence that by substituting Ce with Nd the electronic pairing potential is altered. These results highlight the need for additional experiments and further theoretical calculations to accurately model this unique system.

[1] S. Raymond et al., JPSJ 83, 013707 (2014).

Details

Date:
January 16, 2019
Time:
4:00 pm - 5:00 pm
Event Category:

Venue

2205 NPB