Korringa-like relaxation in the high-temperature phase of A-site ordered YBaMn2O6

S. Schaile, H.-A. Krug von Nidda, J. Deisenhofer, A. Loidl, T. Nakajima, and Y. Ueda
Phys. Rev. B 85, 205121 – Published 11 May 2012

Abstract

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 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 eg electrons.

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  • Received 30 March 2012

DOI:https://doi.org/10.1103/PhysRevB.85.205121

©2012 American Physical Society

Authors & Affiliations

S. Schaile, H.-A. Krug von Nidda, J. Deisenhofer, and A. Loidl

  • Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, D-86135 Augsburg, Germany

T. Nakajima and Y. Ueda

  • Material Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

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Issue

Vol. 85, Iss. 20 — 15 May 2012

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