Antiferromagnetic and superconductivity

Fujiwara E, Eujiwara H, Kobayashi H, Otsuka T, Kobayashi A (2002) A series of organic conductors, K-(BETS)2FeBrxCl4.x (0 < X < 4), exhibiting successive antiferromagnetic and superconducting transitions. Adv Mater 14 1376—1379... 

Figure 8,5 The insulating antiferromagnetic and superconducting phase region for La Sr CuO,...

Fig. 10. Phase diagram of YBa2CUj05+ showing the doping dependence of the antiferromagnetic and superconducting transitions. From Tranquada et al. (1989).

Fig. 17. Local (g-integcated) susceptibility for antiferromagnetic and superconducting Laj jtSr,Cu04. The energies over which magnetic correlations exist ate comparable for jc=0 and jc = 0.14. However, the doped sample displays a low-energy peak in the spectrum at 20-30meV which is not present in the insulator (where the spectrum is maximum at the zone-boundary energy due to the van Hove singularity in the density of states). From Hayden et al. (1998).

The rare earths in their dodecaborides have the 3 + oxidation state except for Yb and Tm which have an intermediate valence state. A recoilless y-ray emission spectrum study of TmB,2 shows no magnetic ordering at 1.35 K the spectra of YbB,2 reveal no magnetic structure to 1.35 K. The compounds HoB,2, ErB,2 order antiferromagnetically, and ZrB,2 and LuB,2 become superconducting < 5.8 K and < 0.48 K, respectively. ... 

Lefebvre S, Wzietek P, Brown S, Bourbonnais C, Jerome D, Meziere C, Eourmigue M, Batial P (2000) Mott transition, antiferromagnetism, and unconventional superconductivity in layered organic superconductors. Phys Rev Lett 85 5420-5423... 

---