Abstract:The theoretical investigations of the superconducting state parameters (SSP) viz. electron-phonon coupling strength λ, Coulomb pseudopotential µ * , transition temperature T C , isotope effect exponent α and effective interaction strength N O V of six binary La 100−C Ga C (C =16, 20, 22, 24, 26 and 28 at. %) metallic glasses have been reported using Ashcroft's empty core (EMC) model potential for the first time. Five local field correction functions proposed by Hartree (H), Taylor (T), Ichimaru-Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are used in the present investigation to study the screening influence on the aforesaid properties. It is observed that the electron-phonon coupling strength λ and the transition temperature T C are quite sensitive to the selection of the local field correction functions, whereas the Coulomb pseudopotential µ * , isotope effect exponent α and effective interaction strength N O V show weak dependences on the local field correction functions. The T C obtained from H-local field correction function are found in qualitative agreement with available experimental data and show almost linear nature with the concentration (C ) of 'Ga' element. A linear T C equation is proposed by fitting the present outcomes for H-local field correction function, which is in conformity with other results for the experimental data. Also, the present results are found to be in qualitative agreement with other such earlier reported data, which confirms the superconducting phase in the metallic glasses.
PACS (2008):
IntroductionOver several decades, considerable theoretical development has taken place in the field of disordered condensed matter physics. Generally, in this field the disorder means it is a periodic random structure. The few examples of this system are crystals with impurities, liquid metals, bi- * E-mail: voraam@yahoo.com nary alloys, metallic glasses etc. The disordered materials are also known as non-crystalline materials. Moreover, the metallic glasses play an important role in the field of materials science and engineering, which opens the door to research for both theoretical and experimental researchers. Such solids have electronic properties normally associated with metals but the atomic arrangement is not periodic. The binary metallic glasses made up of two components of metals provide a physically interesting system for theoretical investigations. Also, the field of electron correlation in condensed matter, espe-