Magnetic flux distribution and magnetic relaxation in polycrystalline Bi,PbSrCaCuO superconductors

J. Paasi; M. Polák; M. Lahtinen; V. Plecháček; L. Söderlund

doi:10.1016/0011-2275(92)90031-5

Magnetic flux distribution and magnetic relaxation in polycrystalline Bi,PbSrCaCuO superconductors

J. Paasi^*, M. Polák, M. Lahtinen, V. Plecháček, L. Söderlund

^*Corresponding author for this work

Not published at VTT

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

20 Citations (Scopus)

Abstract

We have studied magnetic flux distribution and magnetic relaxation in polycrystalline (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+x superconductors at 77 K using a movable miniature Hall sensor. Flux distribution was studied by measuring magnetic field profiles as a function of external field and time. The effects of inter- and intragrain shielding currents on magnetic flux distribution were distinguished using these measurements. The intergrain critical current density can be calculated from the field profile also in the case where intragrain currents are present. The relaxation of inter- and intragrain currents was distinguished and studied. The relaxation was logarithmic in both current systems. The relaxation rates of intergrain currents were remarkably higher than the rates of intragrain currents. When neither internor intragrain currents dominated, the total relaxation was non-logarithmic.

Original language	English
Pages (from-to)	1076-1083
Number of pages	8
Journal	Cryogenics
Volume	32
Issue number	11
DOIs	https://doi.org/10.1016/0011-2275(92)90031-5
Publication status	Published - 1992
MoE publication type	A1 Journal article-refereed

Keywords

Bi,PbSrCaCuO superconductors
magnetic flux distribution
magnetic relaxation

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10.1016/0011-2275(92)90031-5

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title = "Magnetic flux distribution and magnetic relaxation in polycrystalline Bi,PbSrCaCuO superconductors",

abstract = "We have studied magnetic flux distribution and magnetic relaxation in polycrystalline (Bi,Pb)2Sr2Ca2Cu3O10+x superconductors at 77 K using a movable miniature Hall sensor. Flux distribution was studied by measuring magnetic field profiles as a function of external field and time. The effects of inter- and intragrain shielding currents on magnetic flux distribution were distinguished using these measurements. The intergrain critical current density can be calculated from the field profile also in the case where intragrain currents are present. The relaxation of inter- and intragrain currents was distinguished and studied. The relaxation was logarithmic in both current systems. The relaxation rates of intergrain currents were remarkably higher than the rates of intragrain currents. When neither internor intragrain currents dominated, the total relaxation was non-logarithmic.",

keywords = "Bi,PbSrCaCuO superconductors, magnetic flux distribution, magnetic relaxation",

author = "J. Paasi and M. Pol{\'a}k and M. Lahtinen and V. Plech{\'a}{\v c}ek and L. S{\"o}derlund",

year = "1992",

doi = "10.1016/0011-2275(92)90031-5",

language = "English",

volume = "32",

pages = "1076--1083",

journal = "Cryogenics",

issn = "0011-2275",

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TY - JOUR

T1 - Magnetic flux distribution and magnetic relaxation in polycrystalline Bi,PbSrCaCuO superconductors

AU - Paasi, J.

AU - Polák, M.

AU - Lahtinen, M.

AU - Plecháček, V.

AU - Söderlund, L.

PY - 1992

Y1 - 1992

N2 - We have studied magnetic flux distribution and magnetic relaxation in polycrystalline (Bi,Pb)2Sr2Ca2Cu3O10+x superconductors at 77 K using a movable miniature Hall sensor. Flux distribution was studied by measuring magnetic field profiles as a function of external field and time. The effects of inter- and intragrain shielding currents on magnetic flux distribution were distinguished using these measurements. The intergrain critical current density can be calculated from the field profile also in the case where intragrain currents are present. The relaxation of inter- and intragrain currents was distinguished and studied. The relaxation was logarithmic in both current systems. The relaxation rates of intergrain currents were remarkably higher than the rates of intragrain currents. When neither internor intragrain currents dominated, the total relaxation was non-logarithmic.

AB - We have studied magnetic flux distribution and magnetic relaxation in polycrystalline (Bi,Pb)2Sr2Ca2Cu3O10+x superconductors at 77 K using a movable miniature Hall sensor. Flux distribution was studied by measuring magnetic field profiles as a function of external field and time. The effects of inter- and intragrain shielding currents on magnetic flux distribution were distinguished using these measurements. The intergrain critical current density can be calculated from the field profile also in the case where intragrain currents are present. The relaxation of inter- and intragrain currents was distinguished and studied. The relaxation was logarithmic in both current systems. The relaxation rates of intergrain currents were remarkably higher than the rates of intragrain currents. When neither internor intragrain currents dominated, the total relaxation was non-logarithmic.

KW - Bi,PbSrCaCuO superconductors

KW - magnetic flux distribution

KW - magnetic relaxation

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U2 - 10.1016/0011-2275(92)90031-5

DO - 10.1016/0011-2275(92)90031-5

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SN - 0011-2275

VL - 32

SP - 1076

EP - 1083

JO - Cryogenics

JF - Cryogenics

IS - 11

ER -

Magnetic flux distribution and magnetic relaxation in polycrystalline Bi,PbSrCaCuO superconductors

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