Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy. / Arnold, Frank; Nyeki, Jan; Saunders, John.

In: JETP LETTERS, Vol. 107, No. 9, 02.05.2018, p. 577-578.

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Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy. / Arnold, Frank; Nyeki, Jan; Saunders, John.

In: JETP LETTERS, Vol. 107, No. 9, 02.05.2018, p. 577-578.

Research output: Contribution to journalLetter

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@article{21a1aa3459654470915d4d4f03d44d85,
title = "Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy",
abstract = "In this letter we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of microcrystalline graphite. Magnetic field dependent point-contact spectroscopy was carried out at a temperature of 1.8K using an etched aluminium tip. At zero field a gap structure in the differential conductance is observed, showing a gap of Δ = 4.2meV. On applying magnetic fields of up to 500mT, this gap gradually closes, following the theoretical prediction by Ginzburg and Landau for a fully flux-penetrated superconductor. By applying BCS-theory, we infer a criticalsuperconducting temperature of 14K.",
keywords = "Graphite, Graphene, Superconductivity, Point-Contact Spectroscopy",
author = "Frank Arnold and Jan Nyeki and John Saunders",
year = "2018",
month = "5",
day = "2",
doi = "10.1134/S0021364018090023",
language = "English",
volume = "107",
pages = "577--578",
journal = "JETP LETTERS",
issn = "0021-3640",
publisher = "Maik Nauka-Interperiodica Publishing",
number = "9",

}

RIS

TY - JOUR

T1 - Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy

AU - Arnold, Frank

AU - Nyeki, Jan

AU - Saunders, John

PY - 2018/5/2

Y1 - 2018/5/2

N2 - In this letter we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of microcrystalline graphite. Magnetic field dependent point-contact spectroscopy was carried out at a temperature of 1.8K using an etched aluminium tip. At zero field a gap structure in the differential conductance is observed, showing a gap of Δ = 4.2meV. On applying magnetic fields of up to 500mT, this gap gradually closes, following the theoretical prediction by Ginzburg and Landau for a fully flux-penetrated superconductor. By applying BCS-theory, we infer a criticalsuperconducting temperature of 14K.

AB - In this letter we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of microcrystalline graphite. Magnetic field dependent point-contact spectroscopy was carried out at a temperature of 1.8K using an etched aluminium tip. At zero field a gap structure in the differential conductance is observed, showing a gap of Δ = 4.2meV. On applying magnetic fields of up to 500mT, this gap gradually closes, following the theoretical prediction by Ginzburg and Landau for a fully flux-penetrated superconductor. By applying BCS-theory, we infer a criticalsuperconducting temperature of 14K.

KW - Graphite

KW - Graphene

KW - Superconductivity

KW - Point-Contact Spectroscopy

U2 - 10.1134/S0021364018090023

DO - 10.1134/S0021364018090023

M3 - Letter

VL - 107

SP - 577

EP - 578

JO - JETP LETTERS

JF - JETP LETTERS

SN - 0021-3640

IS - 9

ER -