Study of Ferromagnetism in a new High Tc Ferromagnetic Semiconductor K2(S; Ge) without Transition Metal Element
| dc.contributor.author | Kitil, Getahun | |
| dc.date.accessioned | 2018-06-26T06:31:03Z | |
| dc.date.accessioned | 2023-11-09T11:23:36Z | |
| dc.date.available | 2018-06-26T06:31:03Z | |
| dc.date.available | 2023-11-09T11:23:36Z | |
| dc.date.issued | 2007-03 | |
| dc.description.abstract | In the present work we have studied the ferromagnetic properties of a high temperature magnetic semiconductor K2S(Si=Ge) which is free from any transition metal element. A model Hamiltonian taking into account, the exchange interaction of conduction electrons with localized electrons coming from Si/Ge and the host is studied using quantum field theory formalism of Green functions and also using spin wave theory to find expression for Curie temperature, TC, magnetic susceptibility, Â and specific heat capacity of magnons excited. Tc,Â, and C are plotted with concentration of dopants (Si/Ge). The direct proportionality relation of the Curie temperature, Tc and concentration, x of Ge in K2(S; Ge) have been shown. The reduced magnetization vs the reduced temperature graph has been plotted. The plot shows convex curvature. The heat capacity vs temperature has also been plotted. The plot has got parabolic curve nature for low concentration, x = 0:02 and become linear for high concentration, x > 0:08, which are in good agreement with available experiments. We also plotted the graph for the reciprocal of the susceptibility versus temperature difference. As can be seen from the graph the material is in its ferromagnetic state for T < 299:9K. And (1=Â) = 0 at T = TC = 300K, and the graph is straight line after T = 300K. Which shows the material leaves its ferromagnetic state for T = TC. Which are in good agreement with available experiments | en_US |
| dc.identifier.uri | http://10.90.10.223:4000/handle/123456789/3437 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Study of Ferromagnetism | en_US |
| dc.title | Study of Ferromagnetism in a new High Tc Ferromagnetic Semiconductor K2(S; Ge) without Transition Metal Element | en_US |
| dc.type | Thesis | en_US |