Transport properties of YBa_1tn2Cu_1tn3O_1tn7, PrBa_1tn2Cu_1tn3O_1tn7-superlattices [Elektronische Ressource] / von Ayman Mohamed Moussa el Tahan

Description

Mainz,ersitäthranspElortacpropJohannesertiesAoforenYBaam2bCuysik3bOv7Mohamed/PrBaahan2Gharbia,CuT3FOh7ereic-supPherlatticesderDissertationGutenzurerg-UnivErlangungMainzdesonGradesymanDoktorMoussaderTNaturwissenschaftengeb(Drin.Ägyptenr2010er.nat.)..lyIn.troFlduction.1.1.TheoreticalinBac.kground21721.1.Ginzburg.Landau.(GL).theory1.4.......del.........T...2.1.2...26...D...ux-mo....7mo1.1.1.G.L.freewenergy..del.......2.................ham...............high...269dels1.1.2emenGerconductorsL.dieren.tial19equationsx-c.............1.4.2.Flux.AFF).....Bean..............12and1.1.32.1G.L.coherence.length........25.................V.er.............Substrate13.1.2.Relation.b.et.w.een26Bositioncxygen1.and.B.c192Mo.for.v.t.sup.............1.4.1.u.reep.del............14.1.3.Flux.lines....19.Thermal.Assisted.Flo.(T.mo.........1.4.3.mo...........................22.Preparation.Characterization.5.Preparation14.1.3.1.Pinning.mec.hanism......................2.1.1.arget....................15.1.3.2.

Sujets

• Physik

Informations

• Publié par: johannes_gutenberg-universitat_mainz
• Publié le: 01 janvier 2010
• Nombre de lectures: 26
• Poids de l'ouvrage: 16 Mo

Extrait

2010TMainzranspPhortTprophertiesGutenofymanYBain2FCuereic3derOerg-Univ7on/PrBaMoussa2gebCu?gypten3amOac7b-supherlatticesysikDissertationJohanneszurbErlangungersit?tdesvGradesADoktorMohamedderElNaturwissenschaftenahan(Droren.Gharbia,rMainz,er.nat.).CONTENTS.InAssistedtro.ductionu1.1.Theoretical.Bacsupkground.71.4.31.1PreparationGinzburg.Landau.(GL).theory..Mo.................arget...UH...2.1.3...ep...v..7.1.1.1delG.L.free19energy(T...........5.................b...............o..9191.1.2forGtL.dieren.tial.equations1.4.1.reep.............Thermal.Flo.mo.....mo............12221.1.3CharacterizationGPreparationL.coherence.length..........2.1.1...............25.c..............13.1.2.Relation.b.et.w.een.B2.1.4cwith1pressureand.B.c.21.4.dels.ux-mo.emen.in.erconductors...........19.Fl.x-c.mo............14.1.3.Flux.lines......1.4.2.ly.Flux.w.AFF).del.......21.Bean.del...........................2.and.2.2.114.1.3.1.Pinning.mec.hanism......................25.T....................15.1.3.2.Col.lectiv.e.pinning2.1.2theoryV.ham.er.........................26.Substrate......16.1.3.3.Col.lectiv.e.pinning.in.t.w.o.dimensions26.D.osition.high.xygen.............26.5.1.1iv.CONTENTS.2.2.Sup.erlatticesBforYin-planetransptransp.ortorienme.asurpe.men.ts.v.....85.....of......29.2.2.1.Preparation........transp...resistivit.in...the.es...lms.....p.lms...on...(110)...107.....4.3.sup29.2.2.2MaleyCharacte.r.i71zationation...erlattices.mesa.....dep...5.2.ructures.....erature...5.2.2.......Cu.tro.......9129at2.2.3.Photoliwtht-ahog.r(110)aphuyTand.transp6.4.1ortanisotropmeasuremenlmsts...............34.2.3relaxationY/PPsup.erlattices.for.out-of-plane4.3.1transphniqueor.t........The.ac.....5.in.5.1.i..37.2.3.1.Preparation.and.cempharacterizationof.......ransp.cut...........T.endence....37.2.3.2t-vY/.P.sup.erlattice.photolithograph.y6.YBa.O.6.1.................Gro.thin39t2.4.Y/P.sup6.3erlatticeYBCOphotolithographpynefor.relaxation.measuremen102tsted.243O2.5SThic3k.YBa.2.Cun3aneOfor7en/PrBa.2.Cu.3.O.7.sup.erlattices......................6643Magnetization3inIn-planenT4ransperlatticesort.49.3.1.Crystal.structure..68.The.tec.......................4.3.2.normalized.ortex-creep.tiv.energy.......75.Out-of-plane.ort.sup.8150C-axis3.1.1ortOrthorhomnbicstructures.and.tetragonal.structures............82.T.erature.endence.the50y3.2.Matc.hing.b.et82wTeenortYFIBBsta.2.C.u.3.O.7.and.P.r.B5.2.1aemp2depCofuresistance3.O.7....87.Curren.oltage-curv..........50.3.3.V.ortex.d.ynami88csA-axis.ted.2.3.7.91.In.duction...............................6.2.wth.YBCO.lms.dieren52tem3.4eraturesThic.kness.dep.endence93ofGrotheofcriticalthintempwitheratureost.n.aling...........6.4.orien62Y4aMagneticCRelaxation3Measuremen7ts(110)65r4.1iOMagnetically.determined.sup.erconducting.critical.temp.erature104TIc-0l66resistance4.2yMagnetizationunpatternedcurvori-estedand.t.he.magnetically.determined.critical.curren.t.densit.y............CONTENTS.v.6.4.2.I.nt-.pBibliographl.ane.resistance7.2anisotrop.y.for.patterned.(110)-axisofori-.en.ted.lms....uture.on...............117.125...................113.F.direc.i....107.7.Summary.113.7.1.Conclusion..............115.y.List.Publications..ofLISTbOF.FIG.UproR32ES.1.Epitaxial.groywthOof.YBCO.and.PBCOyonort.Sstepsr.T.iOsample3reectivi.........ac...ximit.2.10..32.111.1.P.enetration.depthtopand.co.h.e(YBCO)rence.length.w.YBa.....of.....2.7.......a.....y8.1.2.Fstepsree.energy.as.atfunction.of38 for.39.....Windo.............2.4.of./(PrBCO).....2.5.x-ra.y.Cu....9.1.3.OriginSputteringoftargetsLoren.tz.force.......y.SUPREX.........34.y.erlattice.........2.9.the.metho.......c.l..15.1.4.Larkin.mo.del.offorcollectivin-planee.pinning....Sc.sup.measuremen...P.photolithograph.......40.on.mesa...........17cess.1.5.Sc.heme.of.p.o30tX-raediractionnatial2w6e.lls.......31.Lo.angle.y.t.of.2.3.7...............2.6.rates.the..22.1.6.Magnetic.eld.temp.erature.phase.diagram.of.HTSC33.X-ra.comparison.y......23.1.7.Flux.p.enetration.in.the.Bean2.8mo-susceptibilitdelof.sup...................35.Photolithograph.using.pro.y.d..24.2.1.Cross.section.of36sputteringProcesshamofbithographer.......................37.Bridge.measuremen.of.transp..27.2.2.Catho.de.geometry..2.12.heme.Y/P.erlattice.out-of-plane.ts......2.13.atterning.during.y...............2.14.ws.the.of........28.2.3.T.argets.and.heater.during41sputteringtviii.List=Jof.Fi.gurtheeFIBsv2.15.F.abrication.pro.cess83of.mesatstructures...72...T.v.......80.c...nanostructure.....=..41.2.16.Finalthetopjof.viewv...76.m...for...78...vs....c.83...and.5.4.....patterned.of...of.P...pinning.....linear44activ2.17.P(t)atterningsupforUmagneticdeprelaxation.measuremen.t4.9s.er.......a.vs..).)...U4542.18.Underetc.hing.ocrossofTthic.k79lmstand.go.oad.P.atterninga.....T.....of...R(T)..46.2.19IU-curvThic.k88lmP.atterning.and4.43DmagneticnanostrYucintkOe.ure4.5.of.U.........4.6.u.endence.energy....47Characteristic3.1esYBCOvcrystal.structure.4.8.j.J..............o.w.............U.eraged.t.=.t./51t3.2.X-ra.y.comparison77.vs..11...............The.er.H.diagram........U.for.erlattices..........R(T).mesa.direction..52.3.3.ResistivR(T)emesatransitionsdirectionfor.a.Y.1ResistancePop4mesasup.erlattice.....hematic.cuts.....86.FIB.Y.......8753for3.4(Y6P4)Resistiv.e.transitionsXRDforYBCOamsY.6.P.494sup69erlattice.Relaxation.the.momen.for.20.4.H.30...70.T.ariation.the53barrier3.50Resistiv.e.transitions.for.a.Y.20.P.471supNonerlattice.c.rren.dep.of.ation...........4.7.m.curv54for3.6inResistivestigatedeerlattices.transitions.for73anTheYBCO(lm.m./.).endence......................74.U54a3.7eragedUv0tforvs.sup.e.r.l.attices.with.n.Y.=.4.and.dieren.t4.10nPv.o.er.w.1.j.(.1.j.156(3.81U.0.for.sup.e.r.l.attices4.11withnTPY=P4.and.dieren.t.n.Y..................4.1258creep3.9vCurrenint(dep;endence)of.the.activ.ation.energy......4.13..T.dieren.sup............61.3.10.Critical.temp5.1eratureforvs.Y2/P7YBCOinthic-axiskness.or.PBCO.thic.kness......635.24.1formY6/P4(inT-axis).for.an.Y.11.P.4.sup5.3erlatticevs.inforsmallenedeld.closed.............85.Sc.diagram.lateral.in.structures67.4.2.Magnetic.h.ysteresis5.5curvforescutforinan6P4Y.4.P.4.sup.erlattice.....5.6.e.FIB.nanostructure......68.4.3.Magnetic6.1hpatternsysteresisthecurvthineslfor.dieren.t.sup.erlattices.at.4K......(110)Listrof.Figures.ix.6.26.13Zero-eld-coafterolingtempmagnetization.curvesresistancefor.YBCO.thin.lmsFWHM.....tations96.6.3.SEM.of.YBalongCOSEMlms.preparedcat.the.same.gro(005)wth.temYBCOp.eratures.(610105630)30.C..2.......(110)...v.-axis...YBCO.....6.7.curv...........102.(200).gro.....103.tations.3....97.6.4.SEMYBCOof(110)YB.CO.lms.prepared.at105theandsame.gro.wth.tem.p.eratures.(6506.12690)y0tedC....c.of.-and.....109.AFM.(110).iO.......101.Ro.king.es.annealing.....................6.898for6.5andSEMvs.ofwthYBCOeraturelms.prepared.at.dieren.t6.9groorienwthontempSrTiOe.r.a.t.ures.(750.825).0.C..6.10.orien.on.SrTiO...................6.11.-scan..scan........................10699In-plane6.6anisotropRoforcorienkinglmscurv.es....108.R(T).ur.es.bridges.a.c.directions.........6.14.and.of.on.S.T.3.............110.