Raman and magneto transport studies of MBE grown beta-FeSi_2,beta-(Fe_(1-x)Cr_x)Si_2,and beta-(Fe_(1-x)Co_x)Si_2

摘要

Iron disilicide shows great promise as a silicon based light emitter operating in the 1.3 to 1.5 mum wavelength range.However,there exists a number of questions related to the band structure and the ability to alloy and controllably dope the material both nand p type.In this paper we present Raman and magneto transport studies on beta-FeSi_2,beta-(Fe_(1-x)Cr_x)Si_2,and beta-(Fe_(1-x)Co_x)Si_2 grown by MBE; By comparing the spectra obtained for undoped and doped samples we provide a general overview of the effects of doping on the crystallinity of the material.The temperature dependent (4K