| Autor: |
Guy Dhalenne, F. N. Gygax, A. Schenck, M. Pinkpank, R. Suryanarayanan, Daniel Andreica, Tapan Chatterji, A. Revcolevschi |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Physica B: Condensed Matter. :65-68 |
| ISSN: |
0921-4526 |
| DOI: |
10.1016/s0921-4526(00)00260-x |
| Popis: |
First μSR results for the bilayered manganite LaSr 2 Mn 2 O 7 are reported. We have studied the effect on the relaxation rates of the charge/orbital and antiferromagnetic ordering. Between the charge/orbital ordering temperature ( T CO =220 K) and the antiferromagnetic transition temperature ( T N =170 K), unexpected hysteretic behaviour and field history dependence of the relaxation rates were observed. The field history dependence is observed by increased zero-field relaxation rates after switching the external field on and off again. These effects suggest field induced and residual magnetic correlations above T N which are presumably related to the formation of magneto-elastic polarons. No precession signal was observed for T T N , the only signature of the magnetic transition being the almost complete loss of asymmetry reflecting the wide field distribution at the muon site. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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