Magnetic order and superconductivity

These results give an Immediate explanation for the observed (19) coexistence of the high T. superconductivity and magnetic ordering In the RBa2Cu307- structures. The lack of conduction electron density around the R-slte (J. Yu and A. J. Freeman, to be published) means that the unpaired rare-earth f-electrons are decoupled from the Cooper pairs (i.e., magnetic Isolation) and so cannot pair-break. 

Finally, a different type of competition between superconductivity and magnetic order may be realized in CeCu2 Si2. In this compoimd, the strongly renormalized Fermi liquid seems to be unstable with respect to the formation of both superconducting pairs and an (incommensurate)... 

In the R-M-Sn systems, where M = Co, Ru, Rh, Os, Ir, single crystals of the stannides have been synthesized from the melt of the tin (Cooper 1980, Espinosa 1980, Espinosa et al. 1980, 1982). The obtained compounds are very interesting because among some of them there is superconductivity and magnetic ordering. According to the X-ray data of Cooper (1980) there are five types of structures indicated as phases I, II, III, V VII. 

The ErPd2Sn and YbPd2Sn show the coexistence of the superconductivity and magnetic order (Shelton et al. 1986, Kierstead et al, 1985) (table 15). 

Another U compound that shows superconductivity and magnetic order is UPtg. Although with y=450 mJ mol it belongs to the real heavy-fermion systems, it is comparable to URu2Si2 in many of its physical properties. The static bulk susceptibility... 

Maple, M.B., 1983c, Superconductivity and magnetic order low-temperature phase diagrams, in Proc. Mater. Res. Soc. 1982, Annual Meeting 1982. 

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