Researchers from MIT, University of Basel, Florida State University and National Institute for Materials Science in Japan have reported a “chiral superconductor” – a rhombohedral tetra- and penta-layer graphene material that conducts electricity without resistance, and is also, paradoxically, intrinsically magnetic. The team has found that when four or five sheets of graphene are stacked in this “rhombohedral” configuration, the resulting structure can exhibit exceptional electronic properties that are not seen in graphite as a whole.
In their new study, the scientists isolated microscopic flakes of rhombohedral graphene from graphite, and subjected the flakes to a battery of electrical tests. They found that when the flakes are cooled to 300 millikelvins (about -273 degrees Celsius), the material turns into a superconductor, meaning that any electrical current passing through the material can flow through without resistance. They also found that when they swept an external magnetic field up and down, the flakes could be switched between two different superconducting states, just like a magnet. This suggests that the superconductor has some internal, intrinsic magnetism. Such switching behavior is absent in other superconductors.
Researchers from MIT, University of Basel, Florida State University and National Institute for Materials Science in Japan have reported a “chiral superconductor” – a rhombohedral tetra- and penta-layer graphene material that conducts electricity without resistance, and is also, paradoxically, intrinsically magnetic. The team has found that when four or five sheets of graphene are stacked in this “rhombohedral” configuration, the resulting structure can exhibit exceptional electronic properties that are not seen in graphite as a whole.In their new study, the scientists isolated microscopic flakes of rhombohedral graphene from graphite, and subjected the flakes to a battery of electrical tests. They found that when the flakes are cooled to 300 millikelvins (about -273 degrees Celsius), the material turns into a superconductor, meaning that any electrical current passing through the material can flow through without resistance. They also found that when they swept an external magnetic field up and down, the flakes could be switched between two different superconducting states, just like a magnet. This suggests that the superconductor has some internal, intrinsic magnetism. Such switching behavior is absent in other superconductors.
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