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We report the magnetic and transport properties of the RuFeSb solid solution, showing how the colossal thermoelectric performance of FeSb evolves due to changes in the amount of 3 vs. 4 electron character. The physical property trends shed light on the physical picture underlying one of the best low- thermoelectric power factors known to date. Some of the compositions warrant further study as possible - and -type thermoelements for Peltier cooling well below 300 K. Our findings enable us to suggest possible new Kondo insulating systems that might behave similarly to FeSb as advanced thermoelectrics.


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