Contents - Max-Planck-Institut für Physik komplexer Systeme

Externalcollaborations WithA.ChubukovfromUniversityofWisconsinatMadison(USA)wehave
studiedtheselectionofthemagneticorderintheiron-basedsuperconductorsandtogetherM.Korshunov
andD.MaslovfromtheUniversityofFloridatheunusualbehavioroftheuniformsusceptibilityinthese
compounds. TogetherwithDirkMorrfromUICatChicagoweareworkingontheunderstandingof
theevolutionofthed-wavesuperconductivityinthepresenceofthemagneticandchargeorder. AnotherprojectincollaborationwiththeexperimentalgroupsofProf.BüchnerandD.ArgyrioufromIFWDresdenandHMIinBerlinappliestothestudyofunconventionalsuperconductorswithvariousspectroscopictechniquessuchasnuclearmagneticresonanceorinelasticneutronscattering.TogetherwithP.
Thalmeier(MPI-CPfS)weareworkingontheunderstandingofphysicsofheavy-fermioncompoundsand
superconductorswithrattlingphonons.
Furtheractivities Mydutiesasajunior-professorincludednotonlyscientificresearchwhichisdoneat
the mpipksbutalsoteachingatthePhysicsDepartmentoftheTechnicalUniversityofBraunschweig.
DuringthelasttwoyearsIhavegiventhecourseonComputationalPhysicsI(WinterTerm2008/2009)
fortheBachelorstudents.TogetherwithProf.Hans-HenningKlaußfromTUDresdenIhaveorganized
theInternalSymposiumofDivisionLowTemperaturePhysicsoftheGermanPhysicalSocietySpring
Meetingin2008onSuperconductivityandMagnetismofiron-basedsuperconductors.
Articlescompletedandwrittenatthe mpipksforthelasttwoyears
• JunChang, IlyaEremin, andPeterThalmeier, Superconductivityinbeta-pyrochloreKOs2O6: treatmentwithin
strong-couplingEliashbergtheory,NewJour. Phys. 11,055068(2009),[SpecialissueonSuperconductorswith
ExoticSymmetries]
• A.Chubukov,I.Eremin,andM.M.Korshunov,Ramanresponseinasuperconductorwithextendeds-wavesymmetry:
applicationtoFe-pnictides,Phys.Rev.B79,220501(R)(2009)(editor’schoice)[selectedforaViewpointinPhysics
2,46(2009)articlebyMilesV.Klein]
• M.M.Korshunov,I.Eremin,D.V.Efremov,D.L.Maslov,A.V.Chubukov,Non-analyticspinsusceptibilityofa
nestedFermiliquid:thecaseofFe-basedpnictides,Phys.Rev.Lett102,236403(2009)
• A.Akbari,I.Eremin,P.Thalmeier,andP.Fulde,Theoryofboundstateof4f-excitationsandmagneticresonance
inunconventionalsuperconductors,Phys.Rev.B80,100504(R)(2009).
• K.-Y.Choi,P.Lemmens,I.Eremin,G.Zwicknagl,H.Berger,G.L.Sun,D.L.Sun,C.T.Lin,Self-energyeffects
andelectron-phononcouplinginFe-Assuperconductors,J.Phys.Cond.Matter22,115802(2010)
• I.EreminandA.V.Chubukov,Metallicityofthespindensitywavestateiniron-basedsuperconductors,Phys. Rev.
B81,024511(2010).
• A.Akbari,I.Eremin,andP.Thalmeier,Magneticimpurityresonancestatesandsymmetryofthesuperconducting
orderparameteriniron-basedsuperconductors,Phys.Rev.B81,014524(2010).
• F.Hammerath,S.-L.Drechsler,H.-J.Grafe,G.Lang,G.Fuchs,G.Behr,I.Eremin,M.M.Korshunov,B.Buechner,
SmartdisorderinsuperconductingLaFeAs1−dO0.9F0.1asrevealedbyNMRspectroscopy,Phys.Rev.B81,140504
(R)(2010).
• M.Nicklas,F.Steglich,J.Knolle,I.Eremin,R.Lackner,andE.Bauer,Pair-breakingbynon-magneticimpuritiesin
thenon-centrosymmetricCePt3Si,Phys.Rev.B81,180511(R)(2010).
• D.N.Argyriou,A.Hiess,A.Akbari,I.Eremin,M.M.Korshunov,JinHu,BinQian,ZhiqiangMao,YimingQiu,
CollinBroholm, andW.Bao, Incommensurateitinerantantiferromagneticexcitationsandspinresonanceinthe
FeTe0.6Se0.4superconductor,Phys.Rev.B81,220503(R)(2010).
• J.Knolle,I.Eremin,A.V.Chubukov,andR.Moessner,TheoryofitinerantmagneticexcitationsintheSDWphase
ofiron-basedsuperconductors,Phys.Rev.B81,140506(R)(2010)[Editor’ssuggestion].
3.3.3 Gutzwiller-Fellowship
DiffusionorAbsenceofDiffusioninInfiniteArraysofCoupledRandomNonlinearOscillatorswith
LinearAndersonLocalization?
(Prof.S.Aubry)
Itiswell-knownthatthereisabsenceofdiffusioninarraysofcoupledrandomlinearoscillatorsatstrong
enoughdisorder(Andersonlocalization). Inthatsituation,theeigenspectrumofthelineardynamical
equationsispurelydiscreteandassociatedwithacompletebaseofeigenstates(Andersonmodes)which
areexponentiallylocalized. Thenanywavepacketwhichisinitiallylocalized,isalmostperiodicintime
sinceitdecomposesasanabsolutelyconvergentsumofthosetimeperiodiceigenmodesandconsequently
itremainslocalizedforeverwithoutspreading.
108 DetailsandData