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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/92

Title: THE STUDY OF THE COEXISTENCE OF FERROMAGNETISM AND SUPERCONDUCTIVITY IN ZRZN2
Authors: Paulos, Taddesse
Date Added: 6-Sep-2007
Abstract: We study the possibility of the coexistence of ferromagnetism and superconductivity in a compound ZrZn2. In the first case we derive the triplet equal spin pairing gap equation as a function of exchange splitting Vc. We have also shown that the splitting gap equation can be used to estimate the superconducting temperature,Tsc, of ZrZn2in two aspects: Vc = 0 and Vc 6= 0. Here, we first report that the gap equation allows us the phase transition from A state (paramagnetic state) to A1 or A2 superconducting states. Additionally, for Vc = 0, we find that Tsc = 0.37k and for Vc 6= 0 we also obtain that Tsc = 0.4k for up-up pairing and Tsc = 0.34k for down-down pairing respectively. Here we predict that the highest value of Tsc is related to the majority spin pairing state, and the smallest value of Tsc is related to the minority spin pairing state. On the other hand, we report the phase diagram showing the ferromagnetic Tf and the superconducting Tsc temperatures as a function of pressure in ZrZn2. It is found that both temperatures decrease with increasing pressure and they vanish simultaneously at the critical pressure Pc. Her we report that as the pressure increases more and more spins are fluctuated from their common directions, this effect reduces the transition temperatures of ZrZn2, we suggest that the same electrons are responsible for both ferromagnetism and superconductivity in ZrZn2. We compare our results with the theoretical models and with experimental observations in ZrZn2.
Description: A THESIS PRESENTED TO THE SCHOOL OF GRADUATE STUDIES ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in PHYSICS
URI: http://hdl.handle.net/123456789/92
Appears in:Thesis - Physics

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