Anomalous time-decay in neutron depolarization by high-Tc superconductors

Simple item page
dc.contributor.authorMiles, PAen_AU
dc.contributor.authorKennedy, SJen_AU
dc.contributor.authorTaylor, KNRen_AU
dc.contributor.authorRussell, GJen_AU
dc.contributor.authorWang, Jen_AU
dc.contributor.authorGu, GDen_AU
dc.contributor.authorTakamara, Ken_AU
dc.contributor.authorKoshizuka, Nen_AU
dc.date.accessioned2024-02-29T03:39:06Zen_AU
dc.date.available2024-02-29T03:39:06Zen_AU
dc.date.issued1994-11-09en_AU
dc.date.statistics2022-04-07en_AU
dc.description.abstractIn studies of the- field and time dependence of the polarisation state of a polarised neutron beam transmitted through single crystals of YBa2Cu- (YBCO) and BI2Sr2CaCu202-6 (BSCCO), we have observed some unusual behaviour for temperatures > 60*K for YBCO and 30>T>40K. The observed results suggest that at these temperatures, after removing an external magnetic field, the trapped flux density seen by the neutrons is essentially zero for all time less than = 200msecs. With increasing tune, the sampled flux density increases in magnitude, reaching the values observed in long time (20secs) measurements only after a delay of several seconds. At this time, the trapped flux density reaches a maximum and subsequently decays logarithmically at a rate determined by the effective pinning energy U(H,T). Possible mechanisms responsible for the inverse flux decay are considered. Large anisotropy in this behaviour is observed with the effect not being observed at all with Hlab for BSCCO and no marked temperature onset with YBCO with Hlab. For both YBCO and BSCCO the Hjfc observed flux decay show this behaviour. We conclude that the observed results follow, not from a change in the magnitude of the trapped flux, but rather from a change in the flux distribution within the sample. We interpret this in terms of a domain structure in the flux lattice system which is associated with the fringing closure flux which remains once the external applied field is removed.en_AU
dc.identifier.booktitle18th Annual Consensed Matter Physics Meeting, Charles Sturt University, Riverina, Wagga, Wagga, NSW, 9-11 February 1994, Conference Handooken_AU
dc.identifier.citationMiles, P. A., Kennedy, S. J., Taylor, K. N. R., Russell, G. J., Wang, J., Gu, G. D., Takamura, K., & Koshizuka, N. (1994). Anomalous time-decay in neutron depolarization by high-Tc superconductors. Paper presented to the 18th Annual Consensed Matter Physics Meeting, Charles Sturt University, Riverina, Wagga, Wagga, NSW, 9-11 February 1994. In 18th Annual Consensed Matter Physics Meeting, Charles Sturt University, Riverina, Wagga, Wagga, NSW, 9-11 February 1994, Conference Handook.en_AU
dc.identifier.conferenceenddate1994-02-11en_AU
dc.identifier.conferencename18th Annual Consensed Matter Physics Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, New South Walesen_AU
dc.identifier.conferencestartdate1994-02-09en_AU
dc.identifier.otherTP48en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15490en_AU
dc.language.isoenen_AU
dc.publisherAustralian and New Zealand Institutes of Physicsen_AU
dc.subjectBarium oxidesen_AU
dc.subjectCopper oxidesen_AU
dc.subjectDepolarizationen_AU
dc.subjectHigh-TC superconductorsen_AU
dc.subjectMagnetic fluxen_AU
dc.subjectNeutron beamsen_AU
dc.subjectPolarized beamsen_AU
dc.subjectTemperature dependenceen_AU
dc.subjectTemperature range 0013-0065 Ken_AU
dc.subjectYttrium oxidesen_AU
dc.titleAnomalous time-decay in neutron depolarization by high-Tc superconductorsen_AU
dc.typeConference Abstracten_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
25076715.pdf
Size:
3.71 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications