03_Structural and magnetic properties of HfFe6Ge6-type ErMn6Sn6Gax_1.7

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1、PHYSICALREVIEWB67,134423~2003!StructuralandmagneticpropertiesofHfFe6Ge6-typeErMn6Sn6ÀxGaxxÄ0–2.0compounds1,2,*Shao-yingZhang,1322431Jin-leiYao,JuanDu,MiYan,De-renYang,Li-gangZhang,Shi-minLiu,andBao-genShen1StateKeyLaboratoryofMagnetism,InstituteofPhysicsandCenterforCond

2、ensedMatterPhysics,ChineseAcademyofSciences,Beijing100080,China2StateKeyLaboratoryofSiliconMaterials,ZhejiangUniversity,Hangzhou310027,China3SchoolofMaterialsScienceandEngineering,YanshanUniversity,Qinhuangdao066004,China4DepartmentofAppliedPhysics,UniversityofSciencean

3、dTechnologyofWuhan,Wuhan430081,China~Received30November2002;published24April2003!MagneticandstructuralpropertiesofErMn6Sn62xGax(x5022.0)withtheHfFe6Ge6-typestructurehavebeeninvestigated.Thecompounds(x50.222.0)arecharacterizedbyferrimagneticordering,andCurietem-peratures

4、increasefrom75Kforx50to383Kforx50.4andthendecreaseto288Kforx52.0,whichareduetothecontractionoftheunitcellandthedecreaseofconduction-electrondensitywithGasubstitution.Thecompounds(x50.222.0)displaylargecoercive®elds(0.73

5、neelectric-®eld~CEF!coef®cientA2oftheErsublatticereversesbyasmallamountofGa0substitutionforSn.Moreover,thefourth-orderCEFcoef®cientA4oftheErsublatticeandsixth-orderStevensfactorgJareprovedtoplayimportantrolesinthedeterminationoftheeasymagneticdirection.DOI:10.1103/PhysR

6、evB.67.134423PACSnumber~s!:75.30.Gw,75.50.Gg,75.50.VvThemagneticstructuresandmagneticpropertiesofhex-sizedbyarcmeltingtheconstituentelementsinahighlyagonalHfFe6Ge6-type~spacegroupP6/mmm)RMn6Sn6puri®edAratmosphere,andthenannealingat750°Cfor10(R5Mg,Zr,Hf,Sc,Y,Gd-Tm,Lu!hav

7、ebeenstudieddaysinanevacuatedquartztube.Aftertheheattreatment,1±7x-ray-diffraction~XRD!studieswerecarriedoutusingaextensively.AllthesecompoundsarecomposedofRandMnlayersalternatelystackedalongthecaxis.ThemagneticRigakuRint1400diffractometerwithCuKaradiation.Thestructures

8、arecharacterizedbyferromagnetic(001)MnXRDpatternsindicatealltheErMn6Sn62xGax(0