Induced currents in Bi-(2223) superconducting tapes in a magnetic field

L. Pust; P. Nalevka; A. Galkin; M. R. Koblischka

Induced currents in Bi-(2223) superconducting tapes in a magnetic field

L. Pust, P. Nalevka, A. Galkin, M. R. Koblischka

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

Abstract

The position B_max of the maximum of magnetic hysteresis loops (MHL) close to zero external magnetic field B_ext, in as prepared (Bi,Pb)-2223/Ag tapes, shifts with decreasing temperature anomalously towards positive B_ext on the descending-field branch of MHL. The field B_max increases steeply below 15 K reaching +0.15 T at 2.5 K. B_max(T) is quite similar for rolled and pressed tapes and for tapes with and without a silver sheath. MHL are asymmetric at low temperatures with larger moments on the upper MHL branch. This asymmetry appears below a threshold temperature T^* ≈ 0.6 T_irr, where T_irr is an ″irreversible″ temperature. The rate of flux creep changes very significantly at the MHL maximum. We propose that B_max > 0 can also be observed on a virtual granular superconducting material formed by planes of flat disk-shaped grains with just small contacts at the disk circumferences. B_max is positive due to a change of sign of stray fields close to the grain circumferences.

Original language	English
Pages (from-to)	197-201
Number of pages	5
Journal	Superlattices and Microstructures
Volume	21
Issue number	Suppl A
Publication status	Published - 1997 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Electrical and Electronic Engineering

Cite this

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title = "Induced currents in Bi-(2223) superconducting tapes in a magnetic field",

abstract = "The position Bmax of the maximum of magnetic hysteresis loops (MHL) close to zero external magnetic field Bext, in as prepared (Bi,Pb)-2223/Ag tapes, shifts with decreasing temperature anomalously towards positive Bext on the descending-field branch of MHL. The field Bmax increases steeply below 15 K reaching +0.15 T at 2.5 K. Bmax(T) is quite similar for rolled and pressed tapes and for tapes with and without a silver sheath. MHL are asymmetric at low temperatures with larger moments on the upper MHL branch. This asymmetry appears below a threshold temperature T* ≈ 0.6 Tirr, where Tirr is an ″irreversible″ temperature. The rate of flux creep changes very significantly at the MHL maximum. We propose that Bmax > 0 can also be observed on a virtual granular superconducting material formed by planes of flat disk-shaped grains with just small contacts at the disk circumferences. Bmax is positive due to a change of sign of stray fields close to the grain circumferences.",

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T1 - Induced currents in Bi-(2223) superconducting tapes in a magnetic field

AU - Pust, L.

AU - Nalevka, P.

AU - Galkin, A.

AU - Koblischka, M. R.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - The position Bmax of the maximum of magnetic hysteresis loops (MHL) close to zero external magnetic field Bext, in as prepared (Bi,Pb)-2223/Ag tapes, shifts with decreasing temperature anomalously towards positive Bext on the descending-field branch of MHL. The field Bmax increases steeply below 15 K reaching +0.15 T at 2.5 K. Bmax(T) is quite similar for rolled and pressed tapes and for tapes with and without a silver sheath. MHL are asymmetric at low temperatures with larger moments on the upper MHL branch. This asymmetry appears below a threshold temperature T* ≈ 0.6 Tirr, where Tirr is an ″irreversible″ temperature. The rate of flux creep changes very significantly at the MHL maximum. We propose that Bmax > 0 can also be observed on a virtual granular superconducting material formed by planes of flat disk-shaped grains with just small contacts at the disk circumferences. Bmax is positive due to a change of sign of stray fields close to the grain circumferences.

AB - The position Bmax of the maximum of magnetic hysteresis loops (MHL) close to zero external magnetic field Bext, in as prepared (Bi,Pb)-2223/Ag tapes, shifts with decreasing temperature anomalously towards positive Bext on the descending-field branch of MHL. The field Bmax increases steeply below 15 K reaching +0.15 T at 2.5 K. Bmax(T) is quite similar for rolled and pressed tapes and for tapes with and without a silver sheath. MHL are asymmetric at low temperatures with larger moments on the upper MHL branch. This asymmetry appears below a threshold temperature T* ≈ 0.6 Tirr, where Tirr is an ″irreversible″ temperature. The rate of flux creep changes very significantly at the MHL maximum. We propose that Bmax > 0 can also be observed on a virtual granular superconducting material formed by planes of flat disk-shaped grains with just small contacts at the disk circumferences. Bmax is positive due to a change of sign of stray fields close to the grain circumferences.

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Induced currents in Bi-(2223) superconducting tapes in a magnetic field

Abstract

ASJC Scopus subject areas

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