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Thermodynamic properties of antiferromagnetic superconductors containing nonmagnetic, magnetic, and spin-orbit impurities

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Abstract

Effects of all types of impurities (nonmagnetic, magnetic, and spin-orbit) on an antiferromagnetic superconductor (AFSC) have been investigated by studying the transition temperatureT c and the specific heat jump. We have assumed a one-dimensional electron band. The impurity scattering is treated within the self-consistent Born approximation. We find that: (a) the molecular fieldH Q and the magnetic impurities depress superconductivity of AFSC and their pair-breaking effect is additive; (b) the effect of spin-orbit impurities is the same as that of nonmagnetic impurities—these enhance superconductivity by screening the molecular field; and (c) in the extreme dirty limit, the AFSC is described in terms of an effective pair-breaking parameter given by 1/τeff=1/τ2+H 2Q τ where 1/τ=1/τ1+2/3τso(1/τ1, 1/τ2, and 1/τso, respectively, are the scattering rates from nonmagnetic, magnetic and spin-orbit impurities).

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Chi, H., Nagi, A.D.S. Thermodynamic properties of antiferromagnetic superconductors containing nonmagnetic, magnetic, and spin-orbit impurities. J Low Temp Phys 81, 199–213 (1990). https://doi.org/10.1007/BF00682682

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