Critical state instability in Nb-clad MgB2 superconducting wires

V. Beilin; I. Felner; M. I. Tsindlekht; E. Dul'kin; E. Mojaev; M. Roth

doi:10.1016/j.physc.2007.11.010

Critical state instability in Nb-clad MgB₂ superconducting wires

V. Beilin, I. Felner, M. I. Tsindlekht, E. Dul'kin, E. Mojaev^*, M. Roth

^*Corresponding author for this work

Department of Applied Physics

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

4 Scopus citations

Abstract

Magnetization hysteresis loops of Cu/MgB₂, Nb/MgB₂, Cu/Nb/MgB₂ and Fe/Cu/MgB₂ wires in parallel magnetic fields of up to 5 T were studied in the temperature range from 5 to 35 K. All Nb-clad samples exhibited a thermomagnetic instability (TMI) in the form of magnetization jumps. In a thick wire (about 2 mm in core diameter), the TMI persisted up to the unexpectedly high temperature of 32 K. Thin wires showed low TMI which vanished at T > 10 K. Cu/MgB₂ wires which did not contain a Nb barrier, showed no signs of TMI. The TMI in thin wires exhibited good reproducibility and stability in the jump pattern (JP) (jump amplitudes and positions), while thick wires showed the worst time stability. We found that moderate flat rolling of the round unstable Cu/Nb/MgB₂ wire resulted in negligible TMI at 5 K in the processed flat tape. The TMI amplitudes of studied samples correlated with the adiabatic stability parameter, β^-1.

Original language	English
Pages (from-to)	223-228
Number of pages	6
Journal	Physica C: Superconductivity and its Applications
Volume	468
Issue number	3
DOIs	https://doi.org/10.1016/j.physc.2007.11.010
State	Published - 1 Feb 2008

Bibliographical note

Funding Information:
This research was supported in part by the Israel Science Foundation (ISF, 2004 Grant number: 618/04), by the Klachky Foundation for Superconductivity and by the Ministry of the National Infrastructures of Israel.

Keywords

Critical current
Magnetic properties
MgB
Mixed state

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10.1016/j.physc.2007.11.010

Cite this

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title = "Critical state instability in Nb-clad MgB2 superconducting wires",

abstract = "Magnetization hysteresis loops of Cu/MgB2, Nb/MgB2, Cu/Nb/MgB2 and Fe/Cu/MgB2 wires in parallel magnetic fields of up to 5 T were studied in the temperature range from 5 to 35 K. All Nb-clad samples exhibited a thermomagnetic instability (TMI) in the form of magnetization jumps. In a thick wire (about 2 mm in core diameter), the TMI persisted up to the unexpectedly high temperature of 32 K. Thin wires showed low TMI which vanished at T > 10 K. Cu/MgB2 wires which did not contain a Nb barrier, showed no signs of TMI. The TMI in thin wires exhibited good reproducibility and stability in the jump pattern (JP) (jump amplitudes and positions), while thick wires showed the worst time stability. We found that moderate flat rolling of the round unstable Cu/Nb/MgB2 wire resulted in negligible TMI at 5 K in the processed flat tape. The TMI amplitudes of studied samples correlated with the adiabatic stability parameter, β-1.",

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author = "V. Beilin and I. Felner and Tsindlekht, {M. I.} and E. Dul'kin and E. Mojaev and M. Roth",

note = "Funding Information: This research was supported in part by the Israel Science Foundation (ISF, 2004 Grant number: 618/04), by the Klachky Foundation for Superconductivity and by the Ministry of the National Infrastructures of Israel.",

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AU - Beilin, V.

AU - Felner, I.

AU - Tsindlekht, M. I.

AU - Dul'kin, E.

AU - Mojaev, E.

AU - Roth, M.

N1 - Funding Information: This research was supported in part by the Israel Science Foundation (ISF, 2004 Grant number: 618/04), by the Klachky Foundation for Superconductivity and by the Ministry of the National Infrastructures of Israel.

PY - 2008/2/1

Y1 - 2008/2/1

N2 - Magnetization hysteresis loops of Cu/MgB2, Nb/MgB2, Cu/Nb/MgB2 and Fe/Cu/MgB2 wires in parallel magnetic fields of up to 5 T were studied in the temperature range from 5 to 35 K. All Nb-clad samples exhibited a thermomagnetic instability (TMI) in the form of magnetization jumps. In a thick wire (about 2 mm in core diameter), the TMI persisted up to the unexpectedly high temperature of 32 K. Thin wires showed low TMI which vanished at T > 10 K. Cu/MgB2 wires which did not contain a Nb barrier, showed no signs of TMI. The TMI in thin wires exhibited good reproducibility and stability in the jump pattern (JP) (jump amplitudes and positions), while thick wires showed the worst time stability. We found that moderate flat rolling of the round unstable Cu/Nb/MgB2 wire resulted in negligible TMI at 5 K in the processed flat tape. The TMI amplitudes of studied samples correlated with the adiabatic stability parameter, β-1.

AB - Magnetization hysteresis loops of Cu/MgB2, Nb/MgB2, Cu/Nb/MgB2 and Fe/Cu/MgB2 wires in parallel magnetic fields of up to 5 T were studied in the temperature range from 5 to 35 K. All Nb-clad samples exhibited a thermomagnetic instability (TMI) in the form of magnetization jumps. In a thick wire (about 2 mm in core diameter), the TMI persisted up to the unexpectedly high temperature of 32 K. Thin wires showed low TMI which vanished at T > 10 K. Cu/MgB2 wires which did not contain a Nb barrier, showed no signs of TMI. The TMI in thin wires exhibited good reproducibility and stability in the jump pattern (JP) (jump amplitudes and positions), while thick wires showed the worst time stability. We found that moderate flat rolling of the round unstable Cu/Nb/MgB2 wire resulted in negligible TMI at 5 K in the processed flat tape. The TMI amplitudes of studied samples correlated with the adiabatic stability parameter, β-1.

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