Origin of Ferromagnetism and its pressure and doping dependence in Tl${}_2$Mn${}_2$O${}_7$

T. Saha-Dasgupta, Molly De Raychaudhury, D. D. Sarma

Using NMTO-{\it downfolding} technique, we explore and establish the origin of ferromagnetism in the pyrochlore system, Tl${}_2$Mn${}_2$O${}_7$. It is found to be driven by hybridi…