Multiple magnetic phase transitions,dilute Fe hyperfine fields and europium valence instabilities in RMn2Si2-xGex,R=rare earth |
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Authors: | I. Nowik Y. Levi I. Felner E. R. Bauminger C. Mermelstein |
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Affiliation: | (1) Racah Institute of Physics, The Hebrew University, Jerusalem, Israel |
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Abstract: | Mössbauer studies of dilute57Fe and151Eu in RMn2Si2-xGex (R=La, Sm, Eu and Gd) at temperatures 4.2 K to 480 K have been performed. The diamagnetic iron and europium reveal the magnetic order of the Mn and rare earth sublattices through transferred hyperfine interactions. The57Fe studies show that in LaMn2Si2, LaMn2Ge2, and SmMn2Ge2 the Mn is magnetically ordered above the known Curie temperatures, and the compounds are antiferromagnets up to TN=470 K, 415 K and 385 K respectively. Studies of151Eu in R1-xEuxMn2Si2, (R=La, Gd) display Eu subspectra corresponding to Eu2+, Eu3+ and intermediate valant Eu. All display large magnetic hyperfine fields. |
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