Local magnetization fluctuations in superconducting glasses resolved by Hall sensors

J. Lefebvre; M. Hilke; Z. Altounian; K. W. West; L. N. Pfeiffer

doi:10.1103/PhysRevB.79.184524

Local magnetization fluctuations in superconducting glasses resolved by Hall sensors

J. Lefebvre, M. Hilke, Z. Altounian, K. W. West, L. N. Pfeiffer

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3 Scopus citations

Abstract

We report on magnetization measurements performed on a series of Fex Ni1-x Zr2 superconducting metallic glasses with 0≤x≤0.5 using the Hall effect of a nearby two-dimensional electron gas (2DEG) in a GaAs/ Al0.33 Ga0.67 As heterostructure as a local probe. The great sensitivity of the Hall effect of the 2DEG in such heterostructure is exploited to determine the magnetization of the superconductor due to the Meissner effect and flux trapping. The data are used to determine the lower critical-field Bc1 of the superconductors as a function of temperature. Surprisingly large fluctuations in the magnetization are also observed and attributed to the presence of large flux clusters in the superconductor.

Original language	English (US)
Article number	184524
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.79.184524
State	Published - May 1 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.79.184524

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abstract = "We report on magnetization measurements performed on a series of Fex Ni1-x Zr2 superconducting metallic glasses with 0≤x≤0.5 using the Hall effect of a nearby two-dimensional electron gas (2DEG) in a GaAs/ Al0.33 Ga0.67 As heterostructure as a local probe. The great sensitivity of the Hall effect of the 2DEG in such heterostructure is exploited to determine the magnetization of the superconductor due to the Meissner effect and flux trapping. The data are used to determine the lower critical-field Bc1 of the superconductors as a function of temperature. Surprisingly large fluctuations in the magnetization are also observed and attributed to the presence of large flux clusters in the superconductor.",

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AU - Lefebvre, J.

AU - Hilke, M.

AU - Altounian, Z.

AU - West, K. W.

AU - Pfeiffer, L. N.

PY - 2009/5/1

Y1 - 2009/5/1

N2 - We report on magnetization measurements performed on a series of Fex Ni1-x Zr2 superconducting metallic glasses with 0≤x≤0.5 using the Hall effect of a nearby two-dimensional electron gas (2DEG) in a GaAs/ Al0.33 Ga0.67 As heterostructure as a local probe. The great sensitivity of the Hall effect of the 2DEG in such heterostructure is exploited to determine the magnetization of the superconductor due to the Meissner effect and flux trapping. The data are used to determine the lower critical-field Bc1 of the superconductors as a function of temperature. Surprisingly large fluctuations in the magnetization are also observed and attributed to the presence of large flux clusters in the superconductor.

AB - We report on magnetization measurements performed on a series of Fex Ni1-x Zr2 superconducting metallic glasses with 0≤x≤0.5 using the Hall effect of a nearby two-dimensional electron gas (2DEG) in a GaAs/ Al0.33 Ga0.67 As heterostructure as a local probe. The great sensitivity of the Hall effect of the 2DEG in such heterostructure is exploited to determine the magnetization of the superconductor due to the Meissner effect and flux trapping. The data are used to determine the lower critical-field Bc1 of the superconductors as a function of temperature. Surprisingly large fluctuations in the magnetization are also observed and attributed to the presence of large flux clusters in the superconductor.

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Local magnetization fluctuations in superconducting glasses resolved by Hall sensors

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