Zn-doping effect on the magnetotransport properties of Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta} si

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1、Zn-dopingeffectonthemagnetotransportpropertiesofBi2Sr2−xLaxCuO6+δsinglecrystalsY.Hanaki1,2,∗,YoichiAndo1,2,†,S.Ono1,andJ.Takeya11CentralResearchInstituteofElectricPowerIndustry,Komae,Tokyo201-8511,Japan2DepartmentofPhysics,ScienceUniversityofTokyo,Shinjuku-ku,Tokyo162-8601,Ja

2、pan(February1,2008)WereportthemagnetotransportpropertiesofBi2Sr2−xLaxCu1−zZnzO6+δ(Zn-dopedBSLCO)singlecrystalswithzofupto2.2%.BesidesthetypicalZn-dopingeffectsonthein-planeresistivityandtheHallangle,wedemonstratethatthenatureofthelow-temperaturenormalstateintheZn-dopedsamples

3、issignificantlyalteredfromthatinthepristinesamplesunderhighmagneticfields.Inparticular,weobservenearly-isotropicnegativemagnetoresistanceaswellasanincreaseintheHallcoefficientatverylowtemperaturesinnon-superconductingZn-dopedsamples,whichweproposetobecausedbytheKondoscatteringfr

4、omthelocalmomentsinducedbyZnimpurities.PACSnumbers:74.25.Fy,74.62.Dh,74.20.Mn,74.72.HsEffectsofnonmagneticZnimpuritiesontheelec-ties.Sinceitwasrecentlyrevealed12thatthemetal-to-tronicpropertiesofthehigh-Tccuprateshavebeenin-insulator(M-I)crossoverinthelow-temperaturenormalten

5、sivelystudied,employingalmostallavailableexper-stateofBSLCOoccursatp≃1/8,itisparticularlyin-imentaltools.However,well-controlledstudiesofthetriguingtolookattheeffectofZnatp≃1/8toelucidateZn-dopingeffectsusinghigh-qualitysinglecrystalshavetheimpactofthecharge-stripesinstability

6、inBSLCO.beenmostlylimitedtotheYBa2Cu3O7−δ(YBCO)sys-Inthispaper,wereportthechargetransportproper-temandtheLa2−xSrxCuO4(LSCO)systembecauseoftiesinZn-dopedBSLCO(Bi2Sr2−xLaxCu1−zZnzO6+δ)theavailabilityofsinglecrystals;forexample,inthesinglecrystalswithzofupto2.2%forx=0.50and0.66

7、.otherwisewell-studiedsystemofBi2Sr2CaCu2O8+δ(Bi-TheseLacontentscorrespondtopof∼0.15and∼1/8,2212),high-qualitysinglecrystalscanbegrownwithonlyrespectively,2and2.2%-Znisenoughtocompletelysup-upto∼1%ofZnsubstitution,posingdifficultiesforsys-presssuperconductivityatx=0.66.Weobser

8、vemoretematicstudies.Recently,high-qualitysinglecrystalsoforlessstandardZn-