Spectral properties of superconductors with ferromagnetically ordered magnetic impurities

Persson, Daniel,1987Chalmers tekniska högskola,Chalmers University of Technology (författare)

We present a comprehensive theoretical study of thermodynamic properties of superconductors with a dilute concentration of magnetic impurities, with focus on how the properties of the superconducting host change if the magnetic moments of the impurities order ferromagnetically. Scattering off the magnetic impurities leads to the formation of a band of Yu-Shiba-Rusinov states within the superconducting energy gap that drastically influences superconductivity. In the magnetically ordered system, the magnetization displays a sudden drop as a function of the impurity density or magnetic moment amplitude. The drop occurs as the spin-polarized impurity band crosses the Fermi level and is associated with a quantum phase transition first put forward by Sakurai for the single impurity case. Taking into account that the background magnetic field created by the ordered impurity moments enters as a Zeeman shift, we find that the superconducting phase transition changes from second order to first order for high enough impurity concentrations.

Shevtsov, Oleksii,1988Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)shevtsov (författare)
Löfwander, Tomas,1972Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lofwande (författare)
Fogelström, Mikael,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)fogelstr (författare)
Chalmers tekniska högskola (creator_code:org_t)

Ingår i:Physical Review B - Condensed Matter and Materials Physics92:24, s. 245430-2469-99502469-9969

Av författaren/redakt...: Persson, Daniel, ...; Shevtsov, Oleksi ...; Löfwander, Tomas ...; Fogelström, Mika ...

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