| Autor: |
Schaile, S., von Nidda, H. -A. Krug, Deisenhofer, J., Loidl, A., Nakajima, T., Ueda, Y. |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 85, 205121 (2012) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.85.205121 |
| Popis: |
We report on high-temperature electron spin resonance studies of A-site ordered YBaMn2O6 and disordered Y0.5Ba0.5MnO3. In the disordered sample we find that the linewidth is governed by spin-spin relaxation processes as in many other manganite systems. In contrast we find a Korringa-like spin relaxation with a slope of about 1 Oe/K above the charge-ordering transition and extending up to 930K in the metal ordered YBaMn2O6 samples. A Korringa-law is a clear feature of a truly metallic state, pointing to an unconventional high-temperature phase of these ordered manganites. In agreement with the ESR intensity this suggests that in the metallic high-temperature phase the ESR signal stems from Mn^4+ core spins which relax via the quasi-delocalized e_g electrons. |
| Databáze: |
arXiv |
| Externí odkaz: |
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