SPECIFIC-HEAT OF BCC MO1-XTCX

The low-temperature specific heats of four compositions of bcc Mo1-xTcx (x=0.25,0.45,0.50,and0.54) have been measured. Results indicate that the large normalized energy gaps 2ΔkTc found previously in both bcc and A-15 Mo0.4Tc0.6 exist also at other compositions in the bcc phase away from the bcc phase boundary at x=0.6. A possible cause of this strongcoupling behavior is the presence of a very sharp d-band for 0.5<~x<~0.6 as revealed by the linear term in the specific heat for the three Tc-rich samples reported here and the previous data for bcc Mo0.4Tc0.6. The method for extracting 2ΔkTc values from specific-heat data is discussed, along with possible uncertainties of this method. © 1979 The American Physical Society.