Saturation and intrinsic dynamics of fluxons in NbTi and MgB2

Ralph Chamberlin; Nathan Newman; R. Gandikota; Rakesh Singh; B. H. Moeckly

doi:10.1063/1.2717111

Saturation and intrinsic dynamics of fluxons in NbTi and MgB₂

Ralph Chamberlin, Nathan Newman, R. Gandikota, Rakesh Singh, B. H. Moeckly

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Abstract

The authors measured the remanent magnetization of superconducting NbTi and MgB₂ as a function of time after removing an applied field. At similar reduced temperatures, the density of magnetic flux quanta (fluxons) is found to relax faster in NbTi than in MgB₂. Nearer the transition, the relaxation rate in both materials exhibits a saturation that is independent of the initially applied field. This saturation occurs when the distance between fluxons is comparable to the London penetration depth. The temperature dependence of the saturation and time dependence of the relaxation can be characterized by the Anderson-Kim model [Rev. Mod. Phys. 36, 39 (1964)] for fluxon dynamics.

Original language	English (US)
Article number	132504
Journal	Applied Physics Letters
Volume	90
Issue number	13
DOIs	https://doi.org/10.1063/1.2717111
State	Published - 2007

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2717111

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title = "Saturation and intrinsic dynamics of fluxons in NbTi and MgB2",

abstract = "The authors measured the remanent magnetization of superconducting NbTi and MgB2 as a function of time after removing an applied field. At similar reduced temperatures, the density of magnetic flux quanta (fluxons) is found to relax faster in NbTi than in MgB2. Nearer the transition, the relaxation rate in both materials exhibits a saturation that is independent of the initially applied field. This saturation occurs when the distance between fluxons is comparable to the London penetration depth. The temperature dependence of the saturation and time dependence of the relaxation can be characterized by the Anderson-Kim model [Rev. Mod. Phys. 36, 39 (1964)] for fluxon dynamics.",

author = "Ralph Chamberlin and Nathan Newman and R. Gandikota and Rakesh Singh and Moeckly, {B. H.}",

note = "Funding Information: The authors thank A. Gurevich, J. M. Rowell, and K. E. Schmidt for helpful discussions. The authors also thank R. H. Cantor of Star Cryoelectronics for technical assistance with high-speed SQUID technology. This work was supported by NSF Grant No. DMR-0514592.",

year = "2007",

doi = "10.1063/1.2717111",

language = "English (US)",

volume = "90",

journal = "Applied Physics Letters",

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TY - JOUR

T1 - Saturation and intrinsic dynamics of fluxons in NbTi and MgB2

AU - Chamberlin, Ralph

AU - Newman, Nathan

AU - Gandikota, R.

AU - Singh, Rakesh

AU - Moeckly, B. H.

N1 - Funding Information: The authors thank A. Gurevich, J. M. Rowell, and K. E. Schmidt for helpful discussions. The authors also thank R. H. Cantor of Star Cryoelectronics for technical assistance with high-speed SQUID technology. This work was supported by NSF Grant No. DMR-0514592.

PY - 2007

Y1 - 2007

N2 - The authors measured the remanent magnetization of superconducting NbTi and MgB2 as a function of time after removing an applied field. At similar reduced temperatures, the density of magnetic flux quanta (fluxons) is found to relax faster in NbTi than in MgB2. Nearer the transition, the relaxation rate in both materials exhibits a saturation that is independent of the initially applied field. This saturation occurs when the distance between fluxons is comparable to the London penetration depth. The temperature dependence of the saturation and time dependence of the relaxation can be characterized by the Anderson-Kim model [Rev. Mod. Phys. 36, 39 (1964)] for fluxon dynamics.

AB - The authors measured the remanent magnetization of superconducting NbTi and MgB2 as a function of time after removing an applied field. At similar reduced temperatures, the density of magnetic flux quanta (fluxons) is found to relax faster in NbTi than in MgB2. Nearer the transition, the relaxation rate in both materials exhibits a saturation that is independent of the initially applied field. This saturation occurs when the distance between fluxons is comparable to the London penetration depth. The temperature dependence of the saturation and time dependence of the relaxation can be characterized by the Anderson-Kim model [Rev. Mod. Phys. 36, 39 (1964)] for fluxon dynamics.

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DO - 10.1063/1.2717111

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JF - Applied Physics Letters

IS - 13

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ER -

Saturation and intrinsic dynamics of fluxons in NbTi and MgB₂

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