The dimensionality of quantum critical Ce<sub>2</sub>PdAl<sub>7</sub>Ge<sub>4</sub>
ORAL
Abstract
Ce2PdAl7Ge4 is a layered heavy fermion system that is “born” quantum critical [1]. It displays a diverging specific heat below 10 K without ordering down to 100 mK. Here we probe the magnetic and charge excitations to determine the dimensionality of Ce2PdAl7Ge4 and the related Co analog, which orders magnetically at 1.8 K. Ce2CoAl7Ge4 orders with a complex intra-unit cell magnetic order. Inelastic neutron scattering reveals on Ce2PdAl7Ge4 reveals a diffuse scattering with in-plane correlations, but lacking any measurable correlations between neighboring cerium planes. Complimenting this we performed angle resolved photoemission studies in the VUV and soft X-ray regimes, and found a strongly quasi-2D electronic structure. These results indicate that Ce2PdAl7Ge4 is an ideal system to study quantum criticality and non-Fermi liquid behavior in a canonical 2D Kondo lattice system.
[1] N. Ghimire et al. Phys. Rev. B 93, 205141 (2016)
[1] N. Ghimire et al. Phys. Rev. B 93, 205141 (2016)
*This work was carried out under the auspices of the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.
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Presenters
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Filip Ronning
- Los Alamos National Laboratory (LANL)