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Low Temperature Transport Properties of the Quadrupolar Kondo Lattice System PrTi2Al20
Akito Sakai,Satoru Nakatsuji 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have investigated the low temperature transport properties of the cubic Γ3 compound PrTi2Al20. This is a quadrupolar Kondo lattice system where the nongmagnetic quadrupoles, which form a long-range order at low temperatures, have strong hybridization with the conduction electrons. A sharp drop of the resistivity due to a ferroquadrupole ordering is observed at TQ = 2.0 K. The T2 dependence of the resistivity and the large Sommerfeld coefficient γ above TQ suggest the formation of a heavy-fermion state. The temperature dependence of the resistivity below TQ does not show a power law but exponential law behavior, indicating the emergence of an anisotropy gap Δ in the collective mode associated with the ferroquadrupole order below TQ. The Fisher- Langer relation holds around TQ, suggesting the higher order scattering processes than those in Born approximation are not dominant for this ferroquadrupole ordering.