Journal
PHYSICAL REVIEW B
Volume 85, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.205121
Keywords
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Funding
- Deutsche Forschungs Gemeinschaft via the Collaborative Research Center (Augsburg-Munich) [TRR 80]
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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 1Oe/K above the charge-ordering transition and extending up to 930 K 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 electron spin resonance (ESR) intensity this suggests that in the metallic high-temperature phase the ESR signal stems from Mn4+ core spins which relax via the quasidelocalized e(g) electrons.
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