Fluxoids and neutron polarisation effects

E M  Forgan; P G  Kealey; T M  Riseman; S L  Lee; D M  Paul; C M  Aegerter; R  Cubitt; P  Schleger; A  Pautrat; C  Simon; S T  Johnson

doi:10.1016/S0921-4526(99)00046-0

Fluxoids and neutron polarisation effects

E M Forgan, P G Kealey, T M Riseman, S L Lee, D M Paul, C M Aegerter, R Cubitt, P Schleger, A Pautrat, C Simon, S T Johnson

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

Abstract

There are several ways of investigating flux lines with polarised neutrons. We shall describe our recent work on IN 15 at ILL, investigating spatially varying fields perpendicular to the fluxoid axes, which are present with tilted fields in anisotropic superconductors. These field components may be detected by polarisation analysis of neutrons diffracted by the flux line lattice, and allow a detailed investigation of flux structure in such materials as YBCO and NbSe2. A further application of polarised neutrons is the use of neutron spin-echo techniques to measure the speed of moving flux lines. We have recently demonstrated this in an Nb-Ta alloy on instruments IN11 and IN15, by measuring the energy change of neutrons diffracted by flux lines, which are moving under the influence of a transport current. We shall also comment on others' work on the search for interference terms between flux lattice and nuclear diffraction signals, and the use of neutron depolarisation for investigation of flux distributions in superconductors. (C) 1999 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	115-121
Number of pages	7
Journal	Physica B : Condensed Matter
Volume	267-268
DOIs	https://doi.org/10.1016/S0921-4526(99)00046-0
Publication status	Published - Jun 1999

Keywords

neutron polarisation
type-II superconductors
flux lines
flux flow
VORTEX LATTICE
LINE-LATTICE
UNIAXIAL SUPERCONDUCTORS
DEPOLARIZATION

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10.1016/S0921-4526(99)00046-0

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title = "Fluxoids and neutron polarisation effects",

abstract = "There are several ways of investigating flux lines with polarised neutrons. We shall describe our recent work on IN 15 at ILL, investigating spatially varying fields perpendicular to the fluxoid axes, which are present with tilted fields in anisotropic superconductors. These field components may be detected by polarisation analysis of neutrons diffracted by the flux line lattice, and allow a detailed investigation of flux structure in such materials as YBCO and NbSe2. A further application of polarised neutrons is the use of neutron spin-echo techniques to measure the speed of moving flux lines. We have recently demonstrated this in an Nb-Ta alloy on instruments IN11 and IN15, by measuring the energy change of neutrons diffracted by flux lines, which are moving under the influence of a transport current. We shall also comment on others' work on the search for interference terms between flux lattice and nuclear diffraction signals, and the use of neutron depolarisation for investigation of flux distributions in superconductors. (C) 1999 Elsevier Science B.V. All rights reserved.",

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author = "Forgan, {E M} and Kealey, {P G} and Riseman, {T M} and Lee, {S L} and Paul, {D M} and Aegerter, {C M} and R Cubitt and P Schleger and A Pautrat and C Simon and Johnson, {S T}",

year = "1999",

month = jun,

doi = "10.1016/S0921-4526(99)00046-0",

language = "English",

volume = "267-268",

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journal = "Physica B : Condensed Matter",

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AU - Forgan, E M

AU - Kealey, P G

AU - Riseman, T M

AU - Lee, S L

AU - Paul, D M

AU - Aegerter, C M

AU - Cubitt, R

AU - Schleger, P

AU - Pautrat, A

AU - Simon, C

AU - Johnson, S T

PY - 1999/6

Y1 - 1999/6

N2 - There are several ways of investigating flux lines with polarised neutrons. We shall describe our recent work on IN 15 at ILL, investigating spatially varying fields perpendicular to the fluxoid axes, which are present with tilted fields in anisotropic superconductors. These field components may be detected by polarisation analysis of neutrons diffracted by the flux line lattice, and allow a detailed investigation of flux structure in such materials as YBCO and NbSe2. A further application of polarised neutrons is the use of neutron spin-echo techniques to measure the speed of moving flux lines. We have recently demonstrated this in an Nb-Ta alloy on instruments IN11 and IN15, by measuring the energy change of neutrons diffracted by flux lines, which are moving under the influence of a transport current. We shall also comment on others' work on the search for interference terms between flux lattice and nuclear diffraction signals, and the use of neutron depolarisation for investigation of flux distributions in superconductors. (C) 1999 Elsevier Science B.V. All rights reserved.

AB - There are several ways of investigating flux lines with polarised neutrons. We shall describe our recent work on IN 15 at ILL, investigating spatially varying fields perpendicular to the fluxoid axes, which are present with tilted fields in anisotropic superconductors. These field components may be detected by polarisation analysis of neutrons diffracted by the flux line lattice, and allow a detailed investigation of flux structure in such materials as YBCO and NbSe2. A further application of polarised neutrons is the use of neutron spin-echo techniques to measure the speed of moving flux lines. We have recently demonstrated this in an Nb-Ta alloy on instruments IN11 and IN15, by measuring the energy change of neutrons diffracted by flux lines, which are moving under the influence of a transport current. We shall also comment on others' work on the search for interference terms between flux lattice and nuclear diffraction signals, and the use of neutron depolarisation for investigation of flux distributions in superconductors. (C) 1999 Elsevier Science B.V. All rights reserved.

KW - neutron polarisation

KW - type-II superconductors

KW - flux lines

KW - flux flow

KW - VORTEX LATTICE

KW - LINE-LATTICE

KW - UNIAXIAL SUPERCONDUCTORS

KW - DEPOLARIZATION

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DO - 10.1016/S0921-4526(99)00046-0

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VL - 267-268

SP - 115

EP - 121

JO - Physica B : Condensed Matter

JF - Physica B : Condensed Matter

ER -

Fluxoids and neutron polarisation effects

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Keywords

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