Specific heat and transport properties are measured on good single crystals of SmB6. The specific heat experiment indicates that there is a gap of near 100 K in the 4f system leaving a very small T linear term. Conductivity experiment indicates that the usual hopping type conductivity changes to a constant value without activation which is, however, three orders of magnitude smaller than the so far believed minimum metallic conductivity. The usual Anderson localization proposed before by us is clearly not applicable. Here, we propose a model of a new type of the Wigner lattice formation. Various anomalous properties mentioned above are explained within this model
The thermionic work functions and the Richardson constants for LaB6 single crystals have been measured using a diode system with a guard ring under stable thermionic conditions. They are 2.86±0.03 eV, 82 A/cm2 K2 for the (100) plane, 2.68±0.03 eV, 57 A/cm2 K2 for the (110) plane, and 3.4±0.2 eV, 71 A/cm2 K2 for the (111) plane. The (111) faceting on the (110) plane has an important effect on the reduction of the thermionic current from the (110) plane at 5×10−6 Torr.
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