Energy gap and upper critical field of the new magnetic superconductor Mo3Sb7 found by the Andreev reflection method

We present the data of the point contact ( PC) Andreev-reflection measurements on the new paramagnetic superconductor Mo3Sb7, which were used for finding the energy gap Delta and upper critical field H-c2 for this compound. The maximum gap value, reduced to the zero temperature via the Bardeen - Cooper - Schrieffer (BCS) theory, turned out to be Delta(0)similar or equal to 0.32 meV, which is slightly smaller than that expected from the BCS theory, Delta(BCS)(0) similar or equal to 0.35 meV. The temperature dependence of the gap obeys the BCS theory approximately. The H-c2(0) value of about 16.5 kOe was obtained from fitting the experimental data to the conventional H(T) dependence, which is quadratic in temperature. This value is in close agreement with the result from magnetization measurements of 17.2 kOe.