Femtosecond dynamics of quasi-particles in YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor films

Femtosecond dynamics of quasi-particles in YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor films

The transient electronic response of epitaxially grown YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor thin films in the femtosecond time domain was investigated using transient photoinduced reflectivity ( Delta R) with 60-fs time resolution. For temperatures T>T/sub c/, only a bolometric sign...

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Veröffentlicht in:IEEE transactions on magnetics 1991-03, Vol.27 (2), p.1548-1551
Hauptverfasser: Han, S.G., Vardeny, Z.V., Symko, O.G., Koren, G.
Format: Artikel
Sprache:eng
Schlagworte:
Optical films
Quadratic programming
Reflectivity
Signal resolution
Spontaneous emission
Superconducting epitaxial layers
Superconducting thin films
Temperature
Ultrafast electronics
Ultrafast optics
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container_end_page 1551
container_issue 2
container_start_page 1548
container_title IEEE transactions on magnetics
container_volume 27
creator Han, S.G.
Vardeny, Z.V.
Symko, O.G.
Koren, G.
description The transient electronic response of epitaxially grown YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor thin films in the femtosecond time domain was investigated using transient photoinduced reflectivity ( Delta R) with 60-fs time resolution. For temperatures T>T/sub c/, only a bolometric signal was observed with Delta R>0. For T
doi_str_mv 10.1109/20.133479
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For temperatures T&gt;T/sub c/, only a bolometric signal was observed with Delta R&gt;0. For T&lt;T/sub c/, Delta R&lt;0 with a temperature-dependent rise time on the order of 300 fs was observed, followed by a relaxation (on the order of 3 ps) into a state with Delta R&gt;0. The results for T&lt;T/sub c/ are explained in terms of quasi-particle (QP) electronic response giving Delta R&lt;0. Thus, the femtosecond rise time is interpreted as avalanche multiplication of QP across the gap 2 Delta , and the subsequent picosecond relaxation is interpreted as QP recombination. 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For temperatures T&gt;T/sub c/, only a bolometric signal was observed with Delta R&gt;0. For T&lt;T/sub c/, Delta R&lt;0 with a temperature-dependent rise time on the order of 300 fs was observed, followed by a relaxation (on the order of 3 ps) into a state with Delta R&gt;0. The results for T&lt;T/sub c/ are explained in terms of quasi-particle (QP) electronic response giving Delta R&lt;0. Thus, the femtosecond rise time is interpreted as avalanche multiplication of QP across the gap 2 Delta , and the subsequent picosecond relaxation is interpreted as QP recombination. The QP optical response is explained within the framework of the two-fluid model.</description><subject>Optical films</subject><subject>Quadratic programming</subject><subject>Reflectivity</subject><subject>Signal resolution</subject><subject>Spontaneous emission</subject><subject>Superconducting epitaxial layers</subject><subject>Superconducting thin films</subject><subject>Temperature</subject><subject>Ultrafast electronics</subject><subject>Ultrafast optics</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1991</creationdate><recordtype>article</recordtype><recordid>eNpFkDtPwzAUhS0EEqUwsDJ5ZTDxjR23HqGigFSpSxemyI9ryShpgp0M_fekD4npu0f30xkOIY_AXwC4LsqJQsiFviIz0BIY50pfkxnnsGRaKnlL7nL-maKsgM-IW2M7dBldt_fUH_amjS7TLtDf0eTIepOG6BrMNO7p95sp8mhpWazG0yGK7YkLRj02g6EFzWOP6Vg2uqFLNMSmzffkJpgm48OFc7Jbv-9Wn2yz_fhavW6Y00IzrIJXyiqBWloplHfOS-MlWMeD9UulNHiuLIRyilgZXwEulqWylQEPSszJ87nWpS7nhKHuU2xNOtTA6-M4dTnxNM7kPp3diIj_3vn5B_dSXyc</recordid><startdate>199103</startdate><enddate>199103</enddate><creator>Han, S.G.</creator><creator>Vardeny, Z.V.</creator><creator>Symko, O.G.</creator><creator>Koren, G.</creator><general>IEEE</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>199103</creationdate><title>Femtosecond dynamics of quasi-particles in YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor films</title><author>Han, S.G. ; Vardeny, Z.V. ; Symko, O.G. ; Koren, G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c939-e5fd66b63e94b436dccd4ad41bc0fbd86691d06b1f2fbde5ad51e7826b5a1d163</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>Optical films</topic><topic>Quadratic programming</topic><topic>Reflectivity</topic><topic>Signal resolution</topic><topic>Spontaneous emission</topic><topic>Superconducting epitaxial layers</topic><topic>Superconducting thin films</topic><topic>Temperature</topic><topic>Ultrafast electronics</topic><topic>Ultrafast optics</topic><toplevel>online_resources</toplevel><creatorcontrib>Han, S.G.</creatorcontrib><creatorcontrib>Vardeny, Z.V.</creatorcontrib><creatorcontrib>Symko, O.G.</creatorcontrib><creatorcontrib>Koren, G.</creatorcontrib><collection>CrossRef</collection><jtitle>IEEE transactions on magnetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Han, S.G.</au><au>Vardeny, Z.V.</au><au>Symko, O.G.</au><au>Koren, G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Femtosecond dynamics of quasi-particles in YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor films</atitle><jtitle>IEEE transactions on magnetics</jtitle><stitle>TMAG</stitle><date>1991-03</date><risdate>1991</risdate><volume>27</volume><issue>2</issue><spage>1548</spage><epage>1551</epage><pages>1548-1551</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>The transient electronic response of epitaxially grown YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor thin films in the femtosecond time domain was investigated using transient photoinduced reflectivity ( Delta R) with 60-fs time resolution. For temperatures T&gt;T/sub c/, only a bolometric signal was observed with Delta R&gt;0. For T&lt;T/sub c/, Delta R&lt;0 with a temperature-dependent rise time on the order of 300 fs was observed, followed by a relaxation (on the order of 3 ps) into a state with Delta R&gt;0. The results for T&lt;T/sub c/ are explained in terms of quasi-particle (QP) electronic response giving Delta R&lt;0. Thus, the femtosecond rise time is interpreted as avalanche multiplication of QP across the gap 2 Delta , and the subsequent picosecond relaxation is interpreted as QP recombination. The QP optical response is explained within the framework of the two-fluid model.</abstract><pub>IEEE</pub><doi>10.1109/20.133479</doi><tpages>4</tpages></addata></record>
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subjects Optical films
Quadratic programming
Reflectivity
Signal resolution
Spontaneous emission
Superconducting epitaxial layers
Superconducting thin films
Temperature
Ultrafast electronics
Ultrafast optics
title Femtosecond dynamics of quasi-particles in YBa/sub 2/Cu/sub 3/O/sub 7- delta / superconductor films
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