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Muon spin relaxation experiments have been carried out in the Kondo compound ${\mathrm{PrInAg}}_{2}.$ The zero-field muon relaxation rate is found to be independent of temperature between 0.1 and 10 K, which rules out a magnetic origin (spin freezing or a conventional Kondo effect) for the previously observed specific-heat anomaly at $\ensuremath{\sim}0.5 \mathrm{K}.$ At low temperatures the muon relaxation can be quantitatively understood in terms of the muon's interaction with nuclear magnetism, including hyperfine enhancement of the ${}^{141}\mathrm{Pr}$ nuclear moment at low temperatures. This argues against a ${\mathrm{Pr}}^{3+}$ ground-state electronic magnetic moment, and is strong evidence for the doublet ${\ensuremath{\Gamma}}_{3}$ crystalline-electric-field-split ground state required for a nonmagnetic route to heavy-electron behavior. The data imply the existence of an exchange interaction between neighboring ${\mathrm{Pr}}^{3+}$ ions of the order of 0.2 K in temperature units, which should be taken into account in a complete theory of a nonmagnetic Kondo effect in ${\mathrm{PrInAg}}_{2}.$

physical review. b, condensed matter

Muon spin relaxation and nonmagnetic Kondo state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PrInAg</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Muon spin relaxation and nonmagnetic Kondo state inPrInAg2