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Electrical transport and specific heat properties of Nd_{1-x}Pb_{x}MnO_{3}single crystals for 0.15 < x 0.5 have been studied in low temperature regime.The resistivity in the ferromagnetic insulating (FMI) phase for x < 0.3 has anactivated character. The dependence of the activation gap Delta on doping x hasbeen determined and the critical concentration for the zero-temperaturemetal-insulator transition was determined as x_{c} ~ 0.33. For a metallicsample with x=0.42, a conventional electron-electron (e-e) scattering termproportional T^{2} is found in the low-temperature electrical resistivity,although the Kadowaki-Woods ratio is found to be much larger for this manganitethan for a normal metal. For a metallic sample with x=0.5, a resistivityminimum is observed for x= 0.5. The effect is attributed to weak localizationand can be described by a negative T^{1/2} weak-localization contribution toresistivity for a disordered three-dimensional electron system. The specificheat data have been fitted to contributions from free electrons (gamma), spinexcitations (beta_{3/2}), lattice and a Schottky-like anomaly related to therare-earth magnetism of the Nd ions. The value of gamma is larger than fornormal metals, which is ascribed to magnetic ordering effects involving Nd.Also, the Schottky-like anomaly appears broadened and weakened suggestinginhomogeneous molecular fields at the Nd-sites.

Low Temperature Transport and Specific Heat Studies of Nd_{1-x}Pb_{x}MnO_{3} Single Crystals