Origin of the ESR spectrum in the Prussian Blue analogue RbMn[Fe(CN)6]*H2O

Antal, Á., Jánossy, A., Forró, L., Vertelman, E.J.M., Van Koningsbruggen, Petra and Van Loosdrecht, Paul H.M. (2010). Origin of the ESR spectrum in the Prussian Blue analogue RbMn[Fe(CN)6]*H2O. Physical Review B, 82 (1),

Abstract

We present an ESR study at excitation frequencies of 9.4 GHz and 222.4 GHz of powders and single crystals of a Prussian Blue analogue (PBA), RbMn[Fe(CN)6]*H2O in which Fe and Mn undergoes a charge transfer transition between 175 and 300 K. The ESR of PBA powders, also reported by Pregelj et al. (JMMM, 316, E680 (2007)) is assigned to cubic magnetic clusters of Mn2+ ions surrounding Fe(CN)6 vacancies. The clusters are well isolated from the bulk and are superparamagnetic below 50 K. In single crystals various defects with lower symmetry are also observed. Spin-lattice relaxation broadens the bulk ESR beyond observability. This strong spin relaxation is unexpected above the charge transfer transition and is attributed to a mixing of the Mn3+ - Fe2+ state into the prevalent Mn2+ - Fe3+ state.

Publication DOI: https://doi.org/10.1103/PhysRevB.82.014422
Divisions: Engineering & Applied Sciences > Chemical engineering & applied chemistry
Additional Information: © 2010 The American Physical Society
Uncontrolled Keywords: electron spin resonance,pPrussian blue analog
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2010-07-21
Authors: Antal, Á.
Jánossy, A.
Forró, L.
Vertelman, E.J.M.
Van Koningsbruggen, Petra
Van Loosdrecht, Paul H.M.

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