Intrinsic Superconductivity at 25 K in Highly Oriented Pyrolytic Graphite

Abstract

High resolution magnetoresistance data in highly oriented pyrolytic graphite thin samples manifest non-homogenous superconductivity with critical temperature $T_c\sim 25$K. These data exhibit: i) hysteretic loops of resistance versus magnetic field similar to Josephson-coupled grains, ii) quantum Andreev's resonances and iii) absence of the Schubnikov-de Haas oscillations. The results indicate that graphite is a system with non-percolative superconducting domains immersed in a semiconducting-like matrix. As possible origin of the superconductivity in graphite we discuss interior-gap superconductivity when two very different electronic masses are present.

5 pages, 3 figures

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• High-temperature surface superconductivity in rhombohedral graphite
• Flat band superconductivity in strained Dirac materials
• Evidence of Josephson-coupled superconducting regions at the interfaces of Highly Oriented Pyrolytic Graphite
• Identification of a possible superconducting transition above room temperature in natural graphite crystals
• Evidence for semiconducting behavior with a narrow band gap of Bernal graphite
• Sample Size Effects on the Transport Characteristics of Mesoscopic Graphite Samples
• Granular superconductivity at room temperature in bulk highly oriented pyrolytic graphite samples
• Two topologically distinct Dirac-line semimetal phases and topological phase transitions in rhombohedrally stacked honeycomb lattices
• Vortex Core States in Superconducting Graphene
• Surface superconductivity in multilayered rhombohedral graphene: Supercurrent
• Evidence for room temperature superconductivity at graphite interfaces
• Supercurrent in superconducting graphene
• Triplet proximity effect and odd-frequency pairing in graphene
• Invited review: Graphite and its hidden superconductivity
• The possibility of measuring intrinsic electronic correlations in graphene using a d-wave contact Josephson junction
• Large local Hall effect in pin-hole dominated multigraphene spin-valves
• Nonintrinsic origin of the magnetic-field-induced metal-insulator and electronic phase transitions in graphite
• Superconductivity in graphene stacks: from the bilayer to graphite
• Quantum effects in graphitic materials: Colossal magnetoresistance, Andreev reflections, Little-Parks effect, ferromagnetism, and granular superconductivity
• Quantum Andreev Oscillations in normal-superconducting-normal nanostructures
• Possible superconductivity in multi-layer-graphene by application of a gate voltage
• From Ohmic to Ballistic Transport in Oriented Graphite