Magnetization Measurement of a Possible High-Temperature Superconducting State in Amorphous Carbon Doped with Sulfur
arXiv:0902.4631 · doi:10.1103/PhysRevB.79.233409
Abstract
Magnetization M(T,H) measurements performed on thoroughly characterized commercial amorphous carbon powder doped with sulfur (AC-S), revealed the occurrence of an inhomogeneous superconductivity (SC) below T_c = 38 K. The constructed magnetic field-temperature (H-T) phase diagram resembles that of type-II superconductors. However, AC-S demonstrates a number of anomalies. In particular, we observed (1) a non-monotonic behavior of the lower critical field H_c1(T); (2) a pronounced positive curvature of the "upper critical field boundary" that we associated with the flux lattice melting line Hm(T); (3) a spontaneous ferromagnetic-like magnetization M0 coexisting with SC. Based on the analysis of experimental results we propose a nonstandard SC state in AC-S.
18 pages including 5 figures
References in corpus (12)
- The electronic properties of graphene
- Superconducting states of pure and doped graphene
- Density waves and Cooper pairing on the honeycomb lattice
- Resonating valence bonds and mean-field d-wave superconductivity in graphite
- Graphene Physics in Graphite
- Possibility of High Tc Superconductivity in doped Graphene
- BCS superconductivity of Dirac electrons in graphene layers
- Massive Dirac fermions in single-layer graphene
- Low-energy electrodynamics of superconducting diamond
- Theory of superconductivity of carbon nanotubes and graphene
- Ferromagnetism and Superconductivity in Carbon-Based Systems
- Elasticity and melting of skyrmion flux lattices in p-wave superconductors
Cited by in corpus (9)
- On the superconductivity of graphite interfaces
- Evidence of Josephson-coupled superconducting regions at the interfaces of Highly Oriented Pyrolytic Graphite
- Granular superconductivity at room temperature in bulk highly oriented pyrolytic graphite samples
- Unstable and elusive superconductors
- Heteroatom-doped hydrogenated amorphous carbons, a-C:H:X 'Volatile' silicon, sulphur and nitrogen depletion, blue photoluminescence, diffuse interstellar bands and ferro-magnetic carbon grain connections (Research Note)
- Invited review: Graphite and its hidden superconductivity
- Flat-band superconductivity in periodically strained graphene: mean-field and Berezinskii-Kosterlitz-Thouless transition
- Superconductivity in graphene stacks: from the bilayer to graphite
- Can doping graphite trigger room temperature superconductivity? Evidence for granular high-temperature superconductivity in water-treated graphite powder