Substitution effect on thermal properties of (Lu1-xScx)5Ir4Si10 near the charge-density-wave transitions

We present the results of specific heat, thermal conductivity and thermoelectric power on the substituted rare-earth-transition-metal pseudoternary compounds (Lu1-xScx)(5)IR4Si10 at temperatures between 10 and 300 K. The effects of Sc substitution for Lu in Lu5R4Si10 are systematic studied near the charge-density-wave (CD W) transition. It is found that the CD W transition temperature T-P = 80 K in Lu5Ir4Si10 is decreased linearly by Sc substitution, with a depression rate dT(P)/dx similar to 17.8 (K/at. %). In addition, the CDW transition disappears upon 2% of Sc substitution for Lu. These observations indicate that the effects of both atomic disorder and internal pressure introduced by Sc substitution play important roles to the CDW transitions found in these alloys.