ISSN:
0392-6737
Schlagwort(e):
Mössbauer effect
;
other γ-ray spectroscopy
;
Magnetically ordered materials: other intrinsic properties
;
Magnetic phase boundaries (including magnetic transitions, metamagnetism etc)
;
Conference proceedings
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Summary Dilute57Fe Mössbauer-spectroscopy studies of RMn2X2 (X=Si and/or Ge, R=La, Ce, Pr, Nd, Sm, Eu and Gd) at 4.2 to 650 K yield the following results: Fe in RMn2X2 does not carry a magnetic moment. It reveals the magnetic order in the Mn and R sublattices through transferred hyperfine fields (∼100 kOe). The compounds LaMn2Si2, LaMn2Ge2, CeMn2Ge2, PrMn2Ge2, NdMn2Ge2 and SmMn2Ge2, known to be ferromagnets withT c=300–350 K, are antiferromagnetically ordered above their correspondingT c. TherT N values extend from 385 K (SmMn2Ge2) to 470 K (LaMn2Si2). At the ferromagnetic-antiferromagnetic phase transition, a sharp reorientation of the Mn magnetic moments relative to the crystalline axes occurs. In RMn2Si2−x Ge x with intermediatex values, the Ge is much more dominant in determining the magnetic properties of the Mn sublattice. While PrMn2Si2 is an antiferromagnet (T N=365 K) and PrMn2Ge2 is a ferromagnetantiferromagnet (T c=328 K,T N=415 K), we find that in PrMn2SiGe, the magnetic behaviour is similar to that in pure PrMn2Ge2,T c=305 K andT N=395 K.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02458904
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