Quantum phase transitions in Ce3Pd20Si6
HF metal Ce3Pd20Si6 exhibits an AFQ phase below 0.5K and an AFM phase below 0.31K. The AFM phase can be suppressed by magnetic field of only 0.7T, placing Ce3Pd20Si6 very close to a quantum-critical point. The boundary between phases I and II becomes strongly anisotropic in magnetic fields and splits into two transitions for fields along [001]. At the II-II' transition, the magnetic mode softens and becomes quasielastic, strongly suggesting quantum-critical behavior in the vicinity of this transition. This is consistent with the recently reported quantum-critical behavior at these points in the phase diagram. It was shown that in a multipolar Kondo lattice system with the strong intermixing of the spin and orbital quantum numbers, two distinct QCPs associated with a sequence of Kondo destructions in the spin and orbital sectors are observed. Other HF compounds, like CeCu6-xAux, YFe2Al10, YbRh2Si2 and CeCu2Ge2 were analyzed in terms of signs of quantum criticality. The imaginary part of the susceptibility , shows universal scaling as a function E/T. Presence of two QCPs in Ce3Pd20Si6 indicates a strong necessity for a detailed analysis, similarly to one done in other HF compounds.
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PORTNICHENKO Pavlo; Dmytro Inosov; IVANOV Alexandre; NIKITIN Stanislav and PASCHEN Silke. (2020). Quantum phase transitions in Ce3Pd20Si6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-03-1735
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