釕銅磁性超導(dǎo)體的制備及性能研究.pdf

1、同濟(jì)大學(xué)材料科學(xué)與工程學(xué)院碩士學(xué)位論文釕銅磁性超導(dǎo)體的制備及性能研究姓名：李秀然申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：徐政20021201同濟(jì)大學(xué)碩士學(xué)位論文AbstractLocalmagneticmomentcandisassemblesingletspinningCooperpairs，whichleadtosuperconductivitystrongrejected，namelytheeffectofmagnetismcau

2、sesdismantlingofCooperpairsTheeffectworksbymeansofswapandinteractingwhichincreasedegradingofCooperpairs’gyrationelectron，thatimpedeelectrontobecomeaCooperpaimSupposeinternalfieldexceededmaximumcriticalfieldHc2，itwouldpro

3、duceshieldingelectriccurrentthoughelectromagneticinteractiontoholdinchecksuperconductivityThemagneticforeignsubstanceconcentrationreached1percentwouldcausewhollylossofsuperconductiVityAcoexistenceofsuperconductivityandlo

4、ng—rangeferromagnetismwasdiscoveredintheternaryrare—earthcompoundsErRh484in1976，buttheintermediatetemperaturerangewherebothsuperconductivityandferromagnetismordercancoexistisverynarrow(0gK—I5K)Welltriedandresearchedforal

5、ongperiod，peoplethoughtthatantiferromagnetismandevensuperconductivitycancoexistent，SOisinhomogeneousferromagnetismorderandsupercOnductiVtyButthelater’ferromagnetismorderappeamspiralmodulationorregionalstructure，whichrele

6、asetheeffectthatchecksupemonductivityThecoexistencephenomenaofsuperconductivityandferromagnetismhavebeenfoundalsointhecompoundLnSr2RuCu208(Ln=Eu。Gd)(Ru1212)jn1995Thepaperstudiedthathowtomakethecompound。whatisitsstructure

7、andthereasonwhycancoexistencesuperconductivityandferromagnetismorderSomemainworkshavebeendoneasfollows：InChapter1TheresearchbackgroundofthethemeandthepresentstudysituationforGdSr2RuCu208systemweresummarizedInChapter2Tose