Magnetic Transitions in K-Doped Biphenyl and ${p}$ -Terphenyl

Superconductivity and Phase Stability of Potassium-Intercalated p-Quaterphenyl

“…However, by calculating the total energies at different magnetic states, we found that K 1 C 24 H 18 is stabilized at the antiferromagnetic state with 19.3 meV lower energy than the paramagnetic state. The phenomenon of the x = 1 doping level leading to antiferromagnetic ground state was also observed in K-doped biphenyl and p -terphenyl . These results indicate that the observed superconducting phases are not in the composition of K 1 C 24 H 18 .…”

“…This indicates that the low- T c phase should not be a result of the three-electron doping. Similar to K-doped biphenyl and p -terphenyl, K x C 24 H 18 with high doping levels such as x = 2 and x = 3 was predicted to exhibit the nonmagnetic feature. From this viewpoint, K x C 24 H 18 with the high doping concentration could be a potential superconductor.…”