Competition between disorder and exchange splitting in superconducting ZrZn_2
arXiv:cond-mat/0301364 · doi:10.1088/0953-8984/15/14/102
Abstract
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_σ(ε_F). Assuming p-wave pairing T_{SC} is dependent on D_σ(ε_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.
arXiv comment7 pages, 4 figures, submitted to J. Phys. Cond. Mat
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