Condensed Matter

Magnetism and Superconductivity in Hydrogenated Graphite Foils

Authors: Nadina Gheorghiu, Charles R. Ebbing, Timothy J. Haugan
Comments: 23 Pages.

Unique to certain unconventional superconductors is the coexistence of magnetism and superconductivity. We have previously found ferromagnetism and superconductivity in hydrogenated graphitic materials [1]. Herein we present similar as well as completely new findings this time applicable to hydrogenated graphite foils. As the strength of the magnetic field is increased, the temperature-dependent magnetization shows several important transitions: from a N´eel paramagneticantiferromagnetic transition, to a ferromagnetic superconductor state, to an orbital paramagnetic glass high-temperature superconductor with critical temperature for the dominant phase at Tc ∼ 50 − 60 K. The ferromagnetic state is observed up to room temperature. Thus, the magnetism of hydrogenated low-density carbon graphite foils plays an important role in establishing electronic correlations of which some are superconducting in nature.
Category: Condensed Matter