Ginzburg-Landau equations, interphase surface energy, and the intermediate state of superconductors with a paramagnetic normal state

The effects of a paramagnetic normal state on the superconducting Ginzburg-Landau (GL) equations, the interphase surface energy sigma/sub n/s, and the intermediate-state critical field B/sub c/I of thin films in a perpendicular field are calculated. For a linear H(B) relation, the scaling of lambda/sub L/ into lambda/sub L//(1+4πchi)/sup 1/2/ introduced by Tachiki et al. is adequate for the GL equations and sigma/sub n/s but not for B/sub c/I. For a nonlinear H(B) relation, as might occur for spontaneous ferromagnetism or for fields large enough that the magnetization saturates, neither the GL equations nor sigma/sub n/s, nor B/sub c/I, can be obtained by scaling the nonmagnetic case. These results should be applicable to magnetic superconductors such as ErRh4B4