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The low-carrier ordered phase below the metal-non-metal transition temperature T_MI ~ 63 K of PrRu4P12 is explored by probing magnetoresistance, magnetic susceptibility, thermoelectric power, and Hall effect on high quality single crystals. All the measured properties exhibit the signature of decimation of the Fermi surface below T_MI and anomalous behaviors below 30 K including a large thermoelectric power ~-200 uV/K and a giant negative magnetoresistance (93% at ~0.4 K). The results indicate an additional structure below 30 K and a semimetal-like ground state. The observed anomalous behaviors are most likely associated with the novel role of c-f hybridization between conduction electrons and Pr 4f electrons, whose crystalline electric field level schemes show drastic change below T_MI.

physical review. b, condensed matter and materials physics

Anomalous properties in the low-carrier ordered phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>PrRu</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mtext>P</mml:mtext><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: Consequence of hybridization between conduction and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Pr</mml:mtext><…

Anomalous properties in the low-carrier ordered phase ofPrRu4P12: Consequence of hybridization between conduction andPr<…