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Article: Two-beam photoacoustic phase measurement of the thermal diffusivity of a Gd-doped bulk YBCO superconductor

TitleTwo-beam photoacoustic phase measurement of the thermal diffusivity of a Gd-doped bulk YBCO superconductor
Authors
KeywordsInstruments
Issue Date1996
PublisherAmerican Institute of Physics. The Journal's web site is located at http://ojps.aip.org/rsio/
Citation
Review of Scientific Instruments, 1996, v. 67 n. 4, p. 1564-1569 How to Cite?
AbstractThe two-beam photoacoustic phase measurement was applied to measure quantitatively the thermal diffusivity (s) of a ceramic bulk high-Tc superconductor. Neglecting the effects of thermal dilation, and thermoelastic bending was proved valid in accordance with our composite piston model for the chosen experimental conditions. It was found that s shows different features at the onset and offset temperatures corresponding to the normal–superconducting (NS) transition. A dip was seen at the resistivity transition onset temperature and a cusp at the offset temperature where the electrical resistance disappears. The presence of the cusp at the offset temperature is proposed to be related to weak coupling between superconducting grains. Our studies indicate that the two-beam phase measurement is a very sensitive method for superconductor characterization and NS transition detection. The experimental results also confirm the presence of a large energy gap and strong electron–phonon coupling mechanism in the YBCO superconductor. ©1996 American Institute of Physics.
Persistent Identifierhttp://hdl.handle.net/10722/42435
ISSN
2015 Impact Factor: 1.336
2015 SCImago Journal Rankings: 0.571
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorAravind, Men_HK
dc.contributor.authorFung, PCWen_HK
dc.contributor.authorTang, SYen_HK
dc.contributor.authorTam, HLen_HK
dc.date.accessioned2007-01-29T08:49:59Z-
dc.date.available2007-01-29T08:49:59Z-
dc.date.issued1996en_HK
dc.identifier.citationReview of Scientific Instruments, 1996, v. 67 n. 4, p. 1564-1569en_HK
dc.identifier.issn0034-6748en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42435-
dc.description.abstractThe two-beam photoacoustic phase measurement was applied to measure quantitatively the thermal diffusivity (s) of a ceramic bulk high-Tc superconductor. Neglecting the effects of thermal dilation, and thermoelastic bending was proved valid in accordance with our composite piston model for the chosen experimental conditions. It was found that s shows different features at the onset and offset temperatures corresponding to the normal–superconducting (NS) transition. A dip was seen at the resistivity transition onset temperature and a cusp at the offset temperature where the electrical resistance disappears. The presence of the cusp at the offset temperature is proposed to be related to weak coupling between superconducting grains. Our studies indicate that the two-beam phase measurement is a very sensitive method for superconductor characterization and NS transition detection. The experimental results also confirm the presence of a large energy gap and strong electron–phonon coupling mechanism in the YBCO superconductor. ©1996 American Institute of Physics.en_HK
dc.format.extent113885 bytes-
dc.format.extent26624 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://ojps.aip.org/rsio/en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectInstrumentsen_HK
dc.titleTwo-beam photoacoustic phase measurement of the thermal diffusivity of a Gd-doped bulk YBCO superconductoren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0034-6748&volume=67&issue=4&spage=1564&epage=1569&date=1996&atitle=Two-beam+photoacoustic+phase+measurement+of+the+thermal+diffusivity+of+a+Gd-doped+bulk+YBCO+superconductoren_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1063/1.1146887en_HK
dc.identifier.hkuros20485-
dc.identifier.isiWOS:A1996UG01300025-

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