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1、2HeisenbergFerrimagneticSystemonaTwo-DimensionalHoneycombLattice：Green＇sFunctionApproachCommun.Theor.Phys.(Beijing,China)47(2007)PP.741-746⑥InternationalAcademicPublishersVo1.47,No.4,April15,2007MagneticPropertiesofaMixedSpin-2andonaTwo-DimensionalHoneycombLattice:Spin-5/2HeisenbergFerrimagneticSy
2、stemGreen'sFunctionApproachYAOKai—Lun,,LIJian—Wen,LIUZu—Li,FUHua.Hua,andZULin1DepartmentofPhysics,HuazhongUniversityofScienceandTechnology,Wuhan430074,China2InternationalCenterofMaterialPhysics,theChineseAcademyofSciences,Shenyang110015,China(ReceivedApril30,2006)AbstractThemultisublatticeGreen'sf
3、unctiontechniqueisappliedtostudythemagneticpropertiesofamixedspin一2andspin一5/2Heisenbergferrimagneticsystemonatwo-dlmensionalhoneycomblattice.TheroleofthedifferentinteractionsintheHamiltonianisexplored.Whenonlythenearest—neighborinteractionandthesingle-ionanisotropyarejncluded.ourresultsindicateth
4、attherearecompensationpointsatfinitetemperatures.Whenthenext.nearest—neighborinteractionexceedsaminimumvaluethatdependsontheotherparametersintheHamiltonian,thecompensationpointdisappears.Thenext.nearest—neighborjnteractionhastheeffectofchangingthecompensationtemperature.PACSnumbers:75.10.Jm,75.40.
5、Gb,75.50.GgKeywords:Heisenbergferrimagnetic,Greenfunction,spin—wavespectra,magnetization,criticaltemperature,compensationtemperature1IntroductionRecentlymanyexperimentalstudieshaveaccumulatedintheareaofmolecular—basedmagneticmaterials,andthemagneticpropertiesbecomeanimportantfocusofsci—entificinte
6、rest.【1一引Amongthesematerials.anumberofbimetallicmolecular—basedmagneticmaterials,inwhichtwokindsofmagneticatomsalternateregularly,exhibitferrimagneticpropertiesandseemtoplayanimportantrole.OneexampleistherecentlydevelopedamorphousV(TCNE).orderferrimagneticallyashighas400K.[6}7】Anotherexperimentalg
7、roupsynthesizedcompoundssuchasAMuFeu(c204)3(A=N(n—CH2+1)4,几=35,MII=Mn,Fe),【8】whichhavecriticaltemperaturesbe-tween35and48K,andsomeofthemhavecompensa-tiontemperaturesnear30K,dependingonthekindofacationA+.Thecompen
