Drastic change in transport of entropy with quadrupolar ordering in PrFe${}_4$P${}_{12}$

Abstract

The antiferroquadrupolar ordering of PrFe${}_4$P${}_{12}$ is explored by probing thermal and thermoelectric transport. The lattice thermal conductivity drastically increases with the ordering, as a consequence of a large drop in carrier concentration and a strong electron-phonon coupling. The low level of carrier density in the ordered state is confirmed by the anomalously large values of the Seebeck and Nernst coefficients. The results are reminiscent of URu${}_2$Si${}_2$ and suggest that both belong to the same class of aborted metal-insulator transitions. The magnitude of the Nernst coefficient, larger than in any other metal, indicates a new route for Ettingshaussen cooling at Kelvin temperatures.

final published version

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• Thermoelectric response near a quantum critical point: the case of CeCoIn5
• Thermal resistivity and hydrodynamics of the degenerate electron fluid in antimony
• Heavy Fermion superconductor CeCu${}_2$Si${}_2$ under high pressure: multiprobing the valence crossover
• Giant Nernst effect and bipolarity in the quasi-one-dimensional metal, Li(0.9)Mo(6)O(17)
• On the destruction of the hidden order in URu${}_2$Si${}_2$ by a strong magnetic field
• Skutterudite Results Shed Light on Heavy Fermion Physics
• Giant isotropic Nernst effect in an anisotropic Kondo semimetal
• The role of hyperfine coupling in magnetic and quadrupolar ordering of Pr3Pd20Si6
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