Evidence of upper-critical-field enhancement in K3C60 powders

G.S. Boebinger; T.T.M. Palstra; A. Passner; M.J. Rosseinsky; D.W. Murphy

doi:10.1103/PhysRevB.46.5876

Evidence of upper-critical-field enhancement in K3C60 powders

G.S. Boebinger
, T.T.M. Palstra
, A. Passner
, M.J. Rosseinsky
, D.W. Murphy

Research output: Contribution to journal › Article › Academic

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322 Downloads (Pure)

Abstract

ac susceptibility measurements of superconducting K3C60 powders in magnetic fields to 30 T yield a roughly linear Hc2(T) curve extending up to the highest experimental fields. Samples prepared by two different methods give –dHc2/dT=2.14±0.08 T/K, with Tc=18.7 K. The observed Hc2 at low temperatures exceeds the Hc2(T) curve from the standard theory by Werthamer-Helfand-Hohenberg. We discuss the role of flux motion and evidence for enhancement of Hc2 by intrinsic mechanisms such as strong coupling, Fermi surface anisotropy, and/or granularity of the samples.

Original language	English
Number of pages	4
Journal	Physical Review B
Volume	46
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.46.5876
Publication status	Published - 1992

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@article{e4b7fa48050c4b99a3663acff013ebbe,

title = "Evidence of upper-critical-field enhancement in K3C60 powders",

abstract = "ac susceptibility measurements of superconducting K3C60 powders in magnetic fields to 30 T yield a roughly linear Hc2(T) curve extending up to the highest experimental fields. Samples prepared by two different methods give –dHc2/dT=2.14±0.08 T/K, with Tc=18.7 K. The observed Hc2 at low temperatures exceeds the Hc2(T) curve from the standard theory by Werthamer-Helfand-Hohenberg. We discuss the role of flux motion and evidence for enhancement of Hc2 by intrinsic mechanisms such as strong coupling, Fermi surface anisotropy, and/or granularity of the samples.",

author = "G.S. Boebinger and T.T.M. Palstra and A. Passner and M.J. Rosseinsky and D.W. Murphy",

note = "Relation: http://www.rug.nl/scheikunde/ date\_submitted:2005 Rights: University of Groningen. Materials Science Centre",

year = "1992",

doi = "10.1103/PhysRevB.46.5876",

language = "English",

volume = "46",

journal = "Physical Review B",

issn = "1550-235X",

publisher = "AMER PHYSICAL SOC",

number = "9",

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TY - JOUR

T1 - Evidence of upper-critical-field enhancement in K3C60 powders

AU - Boebinger, G.S.

AU - Palstra, T.T.M.

AU - Passner, A.

AU - Rosseinsky, M.J.

AU - Murphy, D.W.

N1 - Relation: http://www.rug.nl/scheikunde/ date_submitted:2005 Rights: University of Groningen. Materials Science Centre

PY - 1992

Y1 - 1992

N2 - ac susceptibility measurements of superconducting K3C60 powders in magnetic fields to 30 T yield a roughly linear Hc2(T) curve extending up to the highest experimental fields. Samples prepared by two different methods give –dHc2/dT=2.14±0.08 T/K, with Tc=18.7 K. The observed Hc2 at low temperatures exceeds the Hc2(T) curve from the standard theory by Werthamer-Helfand-Hohenberg. We discuss the role of flux motion and evidence for enhancement of Hc2 by intrinsic mechanisms such as strong coupling, Fermi surface anisotropy, and/or granularity of the samples.

AB - ac susceptibility measurements of superconducting K3C60 powders in magnetic fields to 30 T yield a roughly linear Hc2(T) curve extending up to the highest experimental fields. Samples prepared by two different methods give –dHc2/dT=2.14±0.08 T/K, with Tc=18.7 K. The observed Hc2 at low temperatures exceeds the Hc2(T) curve from the standard theory by Werthamer-Helfand-Hohenberg. We discuss the role of flux motion and evidence for enhancement of Hc2 by intrinsic mechanisms such as strong coupling, Fermi surface anisotropy, and/or granularity of the samples.

U2 - 10.1103/PhysRevB.46.5876

DO - 10.1103/PhysRevB.46.5876

M3 - Article

SN - 1550-235X

VL - 46

JO - Physical Review B

JF - Physical Review B

IS - 9

ER -

Evidence of upper-critical-field enhancement in K3C60 powders

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