Unified description of resistivity and thermopower of Pr${}_2$Ir${}_2$O${}_7$: possible influence of crystal field excitation in a Kondo lattice

Abstract

We present experimental evidence of incoherent Kondo scattering as the source of resistivity minima in bulk polycrystalline and nanocrystalline Pr${}_2$Ir${}_2$O${}_7$. The temperature dependence of thermopower shows a positive maximum at high temperature followed by a negative minimum at low temperature, with the sign inversion occurring at a much higher temperature than $T_K$. Moreover, we observe little correlation between TK and intersite coupling strength given by ${\theta }_{CW}$. We describe the temperature dependence of thermopower and resistivity within the framework of crystal field excitation in a Kondo lattice.

7 pages, 5 figures, published in PRB

References in corpus (6)

• An anisotropic local modification of crystal field levels in Pr-based pyrochlores: a muon-induced effect modelled using density functional theory
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• Ordering of the pyrochlore Ising model with the long-range RKKY interaction
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Cited by in corpus (3)

• Phonon thermal Hall effect in a metallic spin ice
• Phonon Thermal Hall Effect in a non-Kramers Paramagnet
• Charge density wave and Weyl Semimetal phase in Y${}_2$Ir${}_2$O${}_7$