Flux line depinning in a magnet-superconductor levitation system

A. N. Terentiev; J. R. Hull; L. E. De Long

doi:10.1016/S0921-4534(00)00904-7

Flux line depinning in a magnet-superconductor levitation system

A. N. Terentiev, J. R. Hull, L. E. De Long

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The AC loss characteristics of a magnet-superconductor system were studied with the magnet fixed to the free end of an oscillating cantilever located near a stationary melt-textured YBCO pellet. Below a threshold AC field amplitude ≈2 Oe, the dissipation of the oscillator is amplitude-independent, characteristic of a linear, non-hysteretic regime. Above threshold, dissipation increases with amplitude, reflecting the depinning and hysteretic motion of flux lines. The threshold AC field is an order of magnitude higher than that measured for the same YBCO material via AC susceptometry in a uniform DC magnetic field. A partial lock-in of flux lines between YBCO ab planes is proposed as the mechanism for the substantial increase of the depinning threshold.

Original language	English
Pages (from-to)	1289-1290
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	341-348
Issue number	PART 3
DOIs	https://doi.org/10.1016/S0921-4534(00)00904-7
State	Published - 2000

Bibliographical note

Funding Information:
Research at U. Kentucky supported by U.S. DOE Grant #DE-FG02-97ER45653; and research at Argonne supported by U.S. DOE Contract W-31-109Eng-38.

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(00)00904-7

Cite this

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title = "Flux line depinning in a magnet-superconductor levitation system",

abstract = "The AC loss characteristics of a magnet-superconductor system were studied with the magnet fixed to the free end of an oscillating cantilever located near a stationary melt-textured YBCO pellet. Below a threshold AC field amplitude ≈2 Oe, the dissipation of the oscillator is amplitude-independent, characteristic of a linear, non-hysteretic regime. Above threshold, dissipation increases with amplitude, reflecting the depinning and hysteretic motion of flux lines. The threshold AC field is an order of magnitude higher than that measured for the same YBCO material via AC susceptometry in a uniform DC magnetic field. A partial lock-in of flux lines between YBCO ab planes is proposed as the mechanism for the substantial increase of the depinning threshold.",

author = "Terentiev, {A. N.} and Hull, {J. R.} and {De Long}, {L. E.}",

note = "Funding Information: Research at U. Kentucky supported by U.S. DOE Grant #DE-FG02-97ER45653; and research at Argonne supported by U.S. DOE Contract W-31-109Eng-38.",

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AU - Terentiev, A. N.

AU - Hull, J. R.

AU - De Long, L. E.

N1 - Funding Information: Research at U. Kentucky supported by U.S. DOE Grant #DE-FG02-97ER45653; and research at Argonne supported by U.S. DOE Contract W-31-109Eng-38.

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N2 - The AC loss characteristics of a magnet-superconductor system were studied with the magnet fixed to the free end of an oscillating cantilever located near a stationary melt-textured YBCO pellet. Below a threshold AC field amplitude ≈2 Oe, the dissipation of the oscillator is amplitude-independent, characteristic of a linear, non-hysteretic regime. Above threshold, dissipation increases with amplitude, reflecting the depinning and hysteretic motion of flux lines. The threshold AC field is an order of magnitude higher than that measured for the same YBCO material via AC susceptometry in a uniform DC magnetic field. A partial lock-in of flux lines between YBCO ab planes is proposed as the mechanism for the substantial increase of the depinning threshold.

AB - The AC loss characteristics of a magnet-superconductor system were studied with the magnet fixed to the free end of an oscillating cantilever located near a stationary melt-textured YBCO pellet. Below a threshold AC field amplitude ≈2 Oe, the dissipation of the oscillator is amplitude-independent, characteristic of a linear, non-hysteretic regime. Above threshold, dissipation increases with amplitude, reflecting the depinning and hysteretic motion of flux lines. The threshold AC field is an order of magnitude higher than that measured for the same YBCO material via AC susceptometry in a uniform DC magnetic field. A partial lock-in of flux lines between YBCO ab planes is proposed as the mechanism for the substantial increase of the depinning threshold.

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Flux line depinning in a magnet-superconductor levitation system

Abstract

Bibliographical note

ASJC Scopus subject areas

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