Abstract
It is well known that antiferromagnetic structures coexist with superconductivity for R = Tm, Er, Ho, and Dy in RNi2B2C where for Tm, Er and Ho the magnetic ordering temperature TN is below the superconducting transition temperature Tc whereas Tc < TN holds for R = Dy. For HoNi2B2C three different types of antiferromagnetic structures have been reported (i) a commensurate one with Ho moments aligned ferromagnetically within layers perpendicular to the tetragonal c axis where consecutive layers are aligned in opposite directions, (ii) an incommensurate spiral along the c axis and (iii) an incommensurate a-axis modulated structure (a*-structure). The commensurate antiferromagnetic structure well coexists with the superconducting state, whereas both incommensurate structures occur in the temperature range where near-reentrant superconductivity is observed. The study of the pseudoquaternary compounds (Ho,Y)Ni2B2C and (Ho,Lu)Ni2B2C has shown that the a*-structure is more important for the reentrant behavior i.e. for enhanced pair breaking in these superconductors. The detailed form of the a*-structure as well as the mechanism for its relationship to reentrant superconductivity are still unknown.
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