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1、EPJmanuscriptNo.(willbeinsertedbytheeditor)MicrowavePropertiesofBa0.6K0.4BiO3CrystalsS.Fricano1,M.Bonura1,A.AglioloGallitto1,M.LiVigni1,L.A.Klinkova2,andN.V.Barkovskii21INFMandDipartimentodiScienzeFisicheeAstronomiche,Universit`adiPalermo,ViaArchirafi36,I-90123Pal
2、ermo(Italy)2InstituteofSolidStatePhysics,Chernogolovka,MoscowDistrict142432,RussiathedateofreceiptandacceptanceshouldbeinsertedlaterAbstract.Wereportonfield-inducedvariationsofthemicrowavesurfaceresistanceat9.6GHzofBa0.6K0.4BiO3crystals.Energylosseshavebeeninvesti
3、gatedasafunctionofthestaticmagneticfieldintherangeoftemperatures4.2K÷Tc.ByanalyzingtheexperimentalresultsintheframeworkoftheCoffeyandClemmodelwedeterminethetemperaturedependenceofthefirst-penetrationfield,up-percriticalfieldanddepinningfrequency.Theresultsshowthatthep
4、inningenergyofthisbismuthatesuperconductorisweakerthanthoseofcuprates.PACS.74.25.HaMagneticproperties–74.25.NfResponsetoelectromagneticfields(nuclearmagneticresonance,surfaceimpedance,etc.)–74.25.OpMixedstate,criticalfields,andsurfacesheaths1Introductionandthelowcr
5、iticalcurrentobservedinthebismuthatesuperconductors.Usually,thepinningcharacteristicsareThebismuthatesuperconductorBa0.6K0.4BiO3(BKBO)extractedfromthefielddependenceofthecriticalcurrent;isoftenclassifiedasahigh-temperaturesuperconductorhowever,sincethecriticalcurre
6、ntofhigh-Tcsuperconduc-becauseoftherelativelyhighcriticaltemperature,Tc≃torsatlowtemperaturesistoolargetobemeasuredby30Kwellabovethatofconventionalsuperconductors.Thedirect-contactmethod,thestudyoftheelectromagneticinterestinthestudyoftheBKBOcompoundisduetothe(em
7、)responseofsuperconductorsinthemixedstateisafactthat,althoughitdoesnotcontaincopper,somechar-moreconvenientmethod.Measurementsofhigh-frequencyacteristicsaresimilartothoseofcupratesuperconductors:emresponseareparticularlysuitabletoinvestigatevor-itisanoxidewithper
8、ovskitestructure,lowcharge-carriertexdynamicsbecausetheyprobethevortexresponseatdensityandsuperconductivitynearametal-insulatortran-verylowcurrents,whenthevort
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