Ultrahigh critical magnetic fields superconductors Pb(0.9)Mo(6)S(7.5)

• Published in: IEEE transactions on magnetics Vol. 17; no. 5; pp. 1642 - 1644
• Main Authors: Drozdova, S, Kalyushnaya, C, Pan, V, Primachenko, V, Shevchenko, A, Shevchuk, N, Shubaev, M
• Format: Journal Article
• Language: English
• Published: 01.09.1981
• ISSN: 0018-9464

Temperature dependences of magnetic susceptibility,chi(T), of single crystals and one-phase polycrystalline ternary molibdenum sulfides with various degree of perfectionalpha =RUL{300K}/RUL{TUL{K}}=beta K(whereRis the electrical resistence, T(K)is the temperature of transition into the superconducting state) have been studied in the temperature range 4,2-300 K. Materials under study had the following superconducting parameters:TUL{K}=beta K, the transition halfwidth for the best samples wasDelta TUL{K}= =0,17 K, dHUL{cUL{2}}/dT=80-105kOe/K. It is found that the magnetic susceptibility of investigated samples is paramagnetic and grows temperature decrease and alpha rise. Strong temperature dependence, chi and the fact thatdchi/dT < 0may be accounted for if to assume that the model of electron energy spectrum is valid for ternary molib-denum salfides. According to this model the energy dependence of the density of electron states has the peak near the Fermi level,N(EUL{F}), and the Fermi level corresponds to that part in theN(EUL{F})curve wheredN(EUL{F})dE > 0. The band structure, model proposed for ternary molybdenum sulfides to explain our experimental results agrees with the dispersion law which is theoretically developed by O. K. Andersen.