Physics – Condensed Matter – Superconductivity
Scientific paper
2003-01-21
J. Phys.:Condens. Matter 15 (2003) L235-L241
Physics
Condensed Matter
Superconductivity
7 pages, 4 figures, submitted to J. Phys. Cond. Mat
Scientific paper
10.1088/0953-8984/15/14/102
We propose a simple picture for the occurrence of superconductivity and the pressure dependence of the superconducting critical temperature, T_{SC}, in ZrZn_2. According to our hypothesis the pairing potential is independent of pressure, but the exchange splitting, E_{xc}, leads to a pressure dependence in the (spin dependent) density of states at the Fermi level, D_\sigma(\epsilon_F). Assuming p-wave pairing T_{SC} is dependent on D_\sigma(\epsilon_F) which ensures that, in the absence of non-magnetic impurities, T_{SC} decreases as pressure is applied until it reaches a minimum in the paramagnetic state. Disorder reduces this minimum to zero, this gives the illusion that the superconductivity disappears at the same pressure as ferromagnetism does.
Annett James F.
Györffy Balazs L.
Powell Ben J.
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