Thermally activated flux creep in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">K</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>single crystals

Buntar, V.; Sauerzopf, F. M.; Weber, Hans; Fischer, J. E.; Kuzmany, H.; Haluška, M.; Lin, C. L.

doi:10.1103/physrevb.54.14952

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…Typical temperature and magnetic field dependencies as well as the time relaxation of the magnetisation M , measured on K 3 C 60 and Rb 3 C 60 superconductors [180,181] with a SQUID magnetometer, are shown in Figs 14, 15 and 16 [182]. We wish to point out, that the ZFC magnetisation shows the flux exclusion from the sample, while the FC magnetisation shows the flux expulsion.…”

Section: (4c) Magnetisation Curvesmentioning

confidence: 99%

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Buntar¹,

Sauerzopf²,

Weber³

1997

Aust. J. Phys.

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A review of some of the solid state and the magnetic properties of fullerenes is presented. We summarise and discuss experimental results on magnetism of pure C60, C70 and higher fullerenes. The main features of the structure and the magnetic properties of intercalated fullerenes, such as metallofullerenes, TDAE-C60 and polymeric A1C60, are presented. Attention is also paid to the mixed state properties of fullerene superconductors, especially to the evaluation of the critical fields and the characteristic lengths of these materials. Some new experimental results on this subject are also presented.

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Section: (4c) Magnetisation Curvesmentioning

confidence: 99%

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Buntar¹,

Sauerzopf²,

Weber³

1997

Aust. J. Phys.

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“…Details of the sample preparation are given elsewhere. 25 The K 3 C 60 crystals are of different quality with shielding fractions (x sh ) from 25% up to 100%. The best crystals, with x sh ϭ100%, have good K 3 C 60 stoichiometry and x-ray diffraction does not show any evidence of other phases, such as KC 60 or C 60 .…”

Section: Methodsmentioning

confidence: 99%

Mixed-state parameters and vortex pinning in single-crystallineK3C60fullerene superconductors

et al. 1997

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We report on detailed magnetic investigations of big K 3 C 60 single crystals with sizes of ϳ1 mm. The samples were characterized by x-ray analysis, neutron diffraction, and ac magnetization measurements. The temperature dependence of the upper and lower critical fields was obtained, the latter by the trapped magneticmoment method. The coherence length and the penetration depth at Tϭ0 and close to the transition temperature were evaluated. The magnetic field and the temperature dependence of the critical current density were studied and the irreversibility lines determined. Long-term magnetic relaxation, measured in a wide range of temperatures and magnetic fields, allowed us to obtain the temperature dependence of the relaxation rate and the flux creep activation energy at different magnetic fields. The influence of sample inhomogeneities on all these properties was investigated. The results are compared to those obtained on powder and polycrystalline samples.

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“…Today most of the characteristics of this class of superconducting materials are known although some important details are still unknown concerning e.g. the atomic structure and the site ordering of the intercalated atoms [3,4] and the mechanisms of pinning including the existence of irreversibility lines [5].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in fullerene compounds

Baenitz

Lüders

1999

Advances in Solid State Physics 38

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In this contribution some superconducting properties of fullerene superconductors are summarized. The dependence of the transition temperature Tc on the internal C60 spacing, on the external pressure and on the magnetic field is related to the density of states at the Fermi level N(EF). From low field magnetization measurements the lower critical fields of Rb3C60 and K2CsC60 are derived and the penetration depths are calculated. Analysing the hysterical magnetization loops in fields up to 9 T in the framework of the Bean model yields estimations of the critical current densities.

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Thermally activated flux creep inK3C60single crystals

Cited by 6 publications

References 21 publications

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Mixed-state parameters and vortex pinning in single-crystallineK3C60fullerene superconductors

Superconductivity in fullerene compounds

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