cuo2平面外非磁性雜質(zhì)對(duì)銅氧化物高溫超導(dǎo)體物理性質(zhì)影響的理論研究

1、青島大學(xué)碩士學(xué)位論文CuO2平面外非磁性雜質(zhì)對(duì)銅氧化物高溫超導(dǎo)體物理性質(zhì)影響的理論研究姓名：萬霞霞申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：理論物理指導(dǎo)教師：袁峰20120604AbstraetThestudyoftheeffectsofimpuritiesincopperoxidematerialsisoneofthehotspotissuestounderstandthemechanismofthehighTcmaterialsInthispaper

2、，withintllet—J—UmodelandtheGutzwillerapproximation，theeffectsonthelocaldensity0fstatesofsingleimpurityoutoftheCu02planeandmanymagneticimpuritiesintheplaneincopperoxidematerialsarestudiedsystemicallyusingtheBdGequationThe

3、paperisorganizedasfollowsInchapterII，abriefreviewaboutthet—J—Umodel，theGutzwillerapproximationtheoryandtheBdGequationisgivenItisbelievedthattheessentiallowenergyphysicsofcopperoxidematerialscarlbedescribedeffectivelybyth

4、e，一J—Umodel，whiletheelectroniccorrelationistreatedproperlvwithintheGutzwillerapproximationtheoryInchapterIII，withintjUmodelwestudytheeffectofsinglenonmagneticimpurityoutoftheCu02planeinthecopperoxidematerialsusingtheGutz

5、willerapproximationtheoryandBdGequation，especiallytheeffectonthelocaldensityofstate(LDOS)WefindthatawayfromtheimpuritytheLDOSshowstypical“V，’shapeasmmetriccurveThesuperconductinggapreducesaroundtheimpuritybuttheimpurityd

6、oesnotdestroythesuperconductingWefindthattheinhomogeneityoriginatesfromnonlinearscreeningoftheionicpotentialwhichintroducedbythedopednonmagneticimpurityInchapterIVThelocaldensityofstates(LDOS)aroundtwononmagneticimpuriti

7、eswhicharelocatedatdifferentsitesisstudiedwithinthetwodimensionaltJUmodelTheorderparametersaredeterminedinaselfconsistentwaywiththeGutzwiUerprojectedmeanfieldapproximationandtheBogoliubovdeGennestheoryWhenthetwoimpuritie

8、sarelocatedoneortwositesawaywefindthesuperconductivitycoherencepeaksaremorestronglysuppressedandthezeroenergypeak(ZEP)hassplitintotwopeaksWhereaswhenthetwoimpuritiesarelocatednexttoeachothertheZEPvanished，andLDOSdoesn’tc