Electrical and thermal transport in single nickel nanowire

The thermal conductivity and electrical resistivity of a suspended nickel nanowire have been measured for T=15–300K. The temperature dependence of the thermal conductivity and the Lorenz number strongly differ from the bulk. The comparison of the transports in the Ni nanowire shows, that at temperatures 75<T<300K Wiedemann–Franz (WF) law holds, whereas at temperatures T<75K the WF law is violated, indicating that thermal current in this material is suppressed more than electrical current. The results are explained by combined effect of confined dimension, enhanced disorder, and grown contribution of N-processes.